Explain the roles of Simple Mail Transfer Protocol and Internet Message Access Protocol in the transmission of emails.

Simple Mail Transfer Protocol governs the sending of email over a network to a mail server while  Protocol and Internet Message Access Protocol govern retrieving emails from email servers.

Explanation:

answerenforce the organization's security policy;

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.