Given the language L= { ab, aa, baa }, which of the following strings are in L* ?

1) abaabaaabaa
2) aaaabaaaa
3) baaaaabaaaab
4) baaaaabaa

Which of the following transport layer protocols is used to support electronic mail?

The protocol data unit (PDU) for the application layer in the Internet stack is

In the IPv4 addressing format, the number of networks allowed under Class C addresses is