You have an on-premises Microsoft Exchange Server 2019 organization.
You plan to configure the environment to support a hybrid deployment.
You need to ensure that you can migrate mailboxes from the on-premises organization to Exchange Online.
Which two ports should be open between Exchange Online and the on-premises organization? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.
A. 25
B. 80
C. 143
D. 389
E. 443
F. 993
