The validCredentials() function contains two parallel arrays of usernames and passwords. Modify validCredentials() to use the .indexOf () method to search the usernames array for the given enteredUsername. If the username is found, the same location in the passwords array should contain the enteredPassword. Return true if the passwords are equal, false otherwise. validCredentials() should also return false if the given username was not found 2 I false otherwise 3 function , enteredPassword) 4 5// Database of usernames and passwords 6 var usernames = ["smith", "tron", 7 var passwords = ["qwerty", "End0fL ine", "year1942", "1adyj123", ace" "ladyj", "anon"]; "PASSWORD"); 9 I Search the usernames array for enteredUsername 10 11 // Only return true if the enteredUsername is in username, and the 12 // same location in passwords is enteredPassword 13 return true 15 17 console. log(" Login for ladyj:"validCredentialsC"Ladyj", "ladyj123)); // true 18 console. log("Login for ace: " validCredentialsC"ace", "wrong"); // false 19 console. log("Login for jake: " validCredentialsC"jake", "???"); // false Run JavaScript Reset code Your console output Login for ladyj: true Login for ace: true Login for jake:

Consider a slotted aloha system, where the time slot equals the fixed duration of each packet. assume that there are 4 stations a,b,c,d sharing the medium. (a) stations a,b,c,d receive one packet each from higher layers at times 1.3, 1.5, 2.6,5.7 respectively. show which transmissions take place when, according to the slottedaloha protocol; describe all transmissions until all four packets have been successful.when needed, each station has access to the following sequence of random number, provided by a random number generator and drawn uniformly between 0 and 1: (1) station a draws numbers: 0.31, 0.27, 0.78, 0.9, 0.9, 0.11, 0. (2) station b draws numbers: 0.45, 0.28, 0.11, 0.83, 0.37, 0.22, 0. (3)station c draws numbers: 0.1, 0.2, 0.3, 0.4, 0. (4) station d draws numbers: 0.36, 0.77, 0.9, 0.1, 0.1, 0.1, 0.1, 0. (b) in slotted aloha, a station transmits in each time slot with a given probability. what probabilities would you assign to each of the four stations so as to: (i) maximize the efficiency of the protocol? (ii) maximize fairness among the four stations? (c) will the efficiency increase or decrease if we modify slotted aloha as follows: (i) get rid of slots and allow stations to transmit immediately? (ii) implement carrier sensing? (iii) implement collision detection? (iv) implement collision avoidance?

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Which element will you include to present numerical on a slide? a: graph b: text c: flowchart d: shapes