Consider the RSA algorithm with public key $e=7$ and $m=33.($Please note that this is a mock example of RSA. The numbers $e,d$ and $m$ consist of hundreds of digits in real life RSA algorithms.$)$

a$)$ What would be a suitable private key $d?$ Why?

b$)$ Suppose you would like to send the plaintext $"2"$ using this RSA mechanism. What is the corresponding ciphertext?

c$)$ How does B decrypt the ciphertext?