What type of parameter requires that the argument used to call the method must have an assigned value?

A(n) ________ is a portion of the document that can be formatted differently from the rest of the document

Fill in the blank(s) with correct word

Once a TCP connection is established, which of the following can maintain the connection when there is no data sent across the wire?

A. watchdog process B. core service C. keep-alive process D. handshake process