What should you recommend?

Your company has an Exchange Server 2016 organization named contoso.com.
You need to recommend a solution that meets following requirements:
A user named User1 must be able to send email messages by using an alias of [email protected] in the
From field.
Recipients of the messages must be prevented from the identifying the actual sender of the message.
User1 and a user named User2 must each receive a copy of replies to [email protected]
What should you recommend?

A.
Create a distribution group named Sales that has an alias of Sales. Add User1 and User2 to the group.
Assign the Send As permissions to User1.

B.
Create a shared mailbox named Sales that has an Alias of Sales. Assign the Receive As permission User1
and User2. Assign the Send As permissions to User1.

C.
Create a shared mailbox named Sales that has an Alias of Sales. Assign the Receive As permission User1
and User2. Assign the Send on Behalf permission to User1.

D.
Create a distribution group named Sales that has an alias of Sales. Add User1 and User2 to the group.
Assign the send on Behalf permission to User1.

Explanation:
http://exchangeserverpro.com/exchange-2010-send-as-permissions-distribution-group/