How many links are needed given 5 stations connected as a mesh network configuration?

Print "usernum1 is negative." if usernum1 is less than 0. end with newline. convert usernum2 to 0 if usernum2 is greater than 10. otherwise, print "usernum2 is less than or equal to 10.". end with newline

Which of the following “invisible” marks represents an inserted tab?

Which operating system is a version of linux?