A variance is the difference between an actual amount and the budgeted amount

_________ mode requires only the implementation of the encryption algorithm and not the decryption algorithm.

A. CBC B. DKS C. ECB D. CTR

If P(t > t.01,v) = 2.50, then the number of degrees of freedom v is:

a. 20 b. 21 c. 22 d. 23