Which settings should you use?

You have a legacy application that needs to send email to employees. The legacy application runs on a client
computer.
The legacy application must send email by using IMAP through Exchange Online.
You need to identify the correct host name and port information.
Which settings should you use?

A.
Imap.office365.com and port 993

B.
Imap.office365.com and port 143

C.
Outlook.office365.com and port 993

D.
Outlook.office365.com and port 143

Explanation:
For Office 365for business, use the following settings.
IMAP4
outlook.office365.com
993 implicit