cryptography/security engineering

Sig is a digital signature scheme. In particular, assume it is the RSA-based digital signature-with-appendix. Assume Bob knows the eneryption and digital signature algorithm and has the valid verification key associated with the signing key of Alice. What is the sequence of operations (in the exact order) that Bob needs to do? Select one: a. Hash, Decrypt, Compare, Decrypt b. Decrypt, Hash, Encrypt, Compare c. Decrypt, Hash, Decrypt, Compare d. Encrypt, Hash, Encrypt, Compare e. Hash, Encrypt, Compare, Decrypt