Which expression has a value of 8, using only four 4s and any of the following: + , – , • , ÷, exponents, and/or parentheses?

A4 • 4 – 4 – 4

B4 • 4 • 4 – 4

C4 • 4 + 4 – 4

D4 • (4 + 4) – 4