Which set of circumstances would a lower priority job run before a higher priority job when both start at the same time?

Under which set of circumstances would a lower priority job run before a higher priority job when both start at the same time?
A. when the lower priority job has multiplexing enabled and can join an existing multiplex group
B. when the lower priority job requires media in a volume pool
C. when the higher priority job can use the media already loaded in the drive
D. when the higher priority job has multiple streams set to 4 and four tape drives are available

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