A Security Administrator is notified that some long-lasting Telnet connections to a mainframe are dropped every time after an hour. The Administrator suspects that the Security Gateway might be blocking these connections. As she reviews the Smart Tracker the Administrator sees the packet is dropped with the error "Unknown established connection". How can she resolve this problem, without causing other security issues? Choose the BEST answer. She can:

A.
increase the session time-out in the mainframe’s Object Properties.

B.
create a new TCP service object on port 23, and increase the session time-out for this object. She only uses this new object in the rule that allows the Telnet connections to the mainframe.

C.
increase the session time-out in the Service Properties of the Telnet service.

D.
increase the session time-out in the Global Properties.

E.
ask the mainframe users to reconnect every time this error occurs.