ural change d. All of the above Question 18 Not yet answered Marked out of 1.00 p Flag question While interoperability and unrestricted connectivity is an important trend in networking, the reality is that many diverse systems with different hardware and software exist. Programming that serves to glue together or mediate between two separate, and usually already existing programs, is known as: (10) Select one: a. Middleware. b. Front-line software. c. Back-line software. d. Firewall software