For the Production Combination of 1,400 A-100's and 900 B-200's

Multiple Choice

For the production combination of 1,400 A-100's and 900 B-200's which resource is "slack" (not fully used) ?

A) circuit boards (only)
B) assembly time (only)
C) both circuit boards and assembly time
D) neither circuit boards nor assembly time
E) cannot be determined exactly