Which of the following are used to generate a message digest

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Which of the following are used to generate a message digest by the network security protocols?
(P) RSA (Q) SHA-1 (R) DES (S) MD5

1. (P) and (R) only
2. (Q) and (R) only
3. (Q) and (S) only
4. (R) and (S) only

Correct Option: C

Q and S only. Both SHA-1 and MD5 can be used to generate a message digest.