The items below that are part of the first eight advantages of using the DBMS approach. a. All are advantages. b. Controlling Redundancy: Eliminate maintaining the same entity instance twice in the datastore. c. Providing Persistent Storage for Program Objects: Persisting (making permanent) the data created or updated by users and applications. d. Providing Backup and Recovery: The database enforces the safe and correct recovery of its information from unexpected system failures. The database also provides for the backup (duplication) of its data onto alternative media such as tapes.

Write a method named addall that could be placed inside the hashintset class. this method accepts another hashintset as a parameter and adds all elements from that set into the current set, if they are not already present. for example, if a set s1 contains [1, 2, 3] and another set s2 contains [1, 7, 3, 9], the call of s1.addall(s2); would change s1 to store [1, 2, 3, 7, 9] in some order. you are allowed to call methods on your set and/or the other set. do not modify the set passed in. this method should run in o(n) time where n is the number of elements in the parameter set passed in.

Cloud computing service providers manage different computing resources based on the services they offer. which resources do iaas and paas providers not manage? iaas providers do not manage the for the client, whereas paas providers usually do not manage the for their clients. iaas- storage server operating system network paas- applications interafce storage vertualiation

Explain how email technologies enable the exchange of messages between users. find out the typical parts of an email address and explain each part.