Which of the following are true regarding the similarities between JES2 and JES3? Select all that apply A. both use a spool B. both use a master I slave relationship between multiple instances of the JES C. both are multi-system in nature D. both have similar operator commands E. both use XCF for communicating across servers F. both use initialization statements G. both provide "up front" device scheduling to minimize delays associated with waiting for resources once a job is in execution