Which of the following would BEST meet this requirement?

A legal services company wants to ensure emails to clients maintain integrity in transit.

Which of the following would BEST meet this requirement? (Select TWO)
A . Signing emails to clients with the organization’s public key
B . Using the organization’s private key to encrypt all communication
C . Implementing a public key infrastructure
D . Signing emails to clients with the organization’s private key
E . Using shared secret keys
F . Hashing all outgoing emails

Answer: D,F