Joe, a User, Reports Intermittent Connectivity Issues, but a Technician

Multiple Choice

Joe, a user, reports intermittent connectivity issues, but a technician notices that the only time Joe has issues is when he is logged into the database. Losing connection after authenticating to a database, but still having access to network resources such as file/print services and email, would MOST likely be caused by:

A) an incorrect DHCP gateway setting
B) a duplicate IP address
C) NTP synchronization
D) ACL configuration