Your network contains an Active Directory domain named contoso.com. You have a Microsoft Exchange Server 2019 organization for contoso.com that has two Internet-facing servers named EX01 and EX02. In the public DNS zone, you have two MX records for contoso.com. You discover that all email sent to the organization is delivered to EX01. However, when EX01 is down for maintenance, email messages are delivered successfully to EX02. You need to ensure that email is delivered to both EX01 and EX02 during normal operations. What should you modify?
A. the priority of the MX records
B. the properties of the Receive connector on EX01
C. the properties of the Receive connector on EX02
D. the weight of the MX records