Select the form control below that would be appropriate to accept comments about your web site.

Which key do you hold down to select a group of contiguous files?

A) Ctrl B) F1 C) Alt D) Shift

Are the following sets closed under the following operations? If not, what are their respective closures?

What will be an ideal response? a) The even length strings over the alphabet {a, b} under Kleene star. b) The odd length strings over the alphabet {a, b} under concatenation.