Which of the following types of checks is not likely to be performed by a virtual memory addressing mechanism?

a. The address translation table is examined to determine the real memory address for the block number of the virtual memory address

b. The real memory address that corresponds to the virtual memory address is checked to see that it contains zeros

c. The displacement is checked to see that it is within the boundaries of the block

d. The actions to be undertaken on the block are checked to determine whether they are within the allowed set of actions