Company.com wishes to

Company.com wishes to use HACMP on two IBM eServer pSeries servers. During the planning  session， it was decided to use the native serial ports s1 or s2 for a non-IP heartbeat network.  What should be done to ensure the serial network will function with HACMP heartbeats？（）  

• A、 Use either s1 or s2 port configured as a TTY interface with a NULL Modem cable.
• B、 Use the s2 serial port on each system configured as a TTY interface with a NULL modem cable.
• C、 Use the s1 port on each system configured as a TTY interface with a standard serial modemcable.
• D、 Verify with IBM support which native serial ports for the server model can be used for HACM  pheartbeats.