Respuesta :
As she is on vacation she can use the email forwarding service to her coworkers and thereby should configure a response for the external senders. Hence option A is correct.
What are external senders ?
The external senders are recipients in the mail that can be labeled as external that is they are an outside source and hence they are external to the internal company and hence need to be informed. As she is out for a vacation she can configure the mail client to send the message regarding her vacation.
Find out more information about the external senders.
brainly.com/question/8909755