What is the hexadecimal equivalent of a binary number 10101111 A. AF B. 9E C. 8C D. All of the above E. None of the above

The hexadecimal equivalent of a binary number 10101111 is $\boxed{\text{AF}}$.

To convert a binary number to hexadecimal, you can use the following table:

Binary | Hexadecimal
——- | ——–
0000 | 0
0001 | 1
0010 | 2
0011 | 3
0100 | 4
0101 | 5
0110 | 6
0111 | 7
1000 | 8
1001 | 9
1010 | A
1011 | B
1100 | C
1101 | D
1110 | E
1111 | F

In this case, the binary number 10101111 can be broken down into groups of four bits, starting from the right:

1010
1111

The first group, 1010, is equivalent to the hexadecimal number A. The second group, 1111, is equivalent to the hexadecimal number F. Therefore, the hexadecimal equivalent of the binary number 10101111 is $\boxed{\text{AF}}$.