An Adaptive Lock Is a Mutual Exclusion Lock That __________

An adaptive lock is a mutual exclusion lock that __________.

A) can either be held by one process in exclusive mode or several processes in shared mode
B) allows a process to specify the amount of time it will hold the lock; other waiting processes can use this time to determine whether to spin or block.
C) allows the system to change whether the lock is spinning or blocking based on the system load
D) allows the system to switch between allowing only kernel-mode components to hold the lock and allowing all processes to hold the lock