Check-in, initial briefing, recordkeeping, and demobilization procedures are all necessary to ensure:
a. sustainability.
b. flexibility.
c. accountability.
d. redundancy.

Within the relevant range, if there is a change in the level of the cost driver, then a. total fixed costs will remain the same and total variable costs will change b. total fixed costs will change and total variable costs will remain the same c. total fixed costs and total variable costs will change d. total fixed costs and total variable costs will remain the same