Which of the following is/are example(s) of stateful application

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Which of the following is/are example(s) of stateful application layer protocols?
(i) HTTP (ii) FTP (iii) TCP (iv) POP3

1. (i) and (ii) only
2. (ii) and (iii) only
3. (ii) and (iv) only
4. (iv) only

Correct Option: C

TCP is stateful as it maintains connection information across multiple transfers, but TCP is not an application layer protocol. Of the given protocols, only FTP and POP3 are stateful application layer protocols.