(Choose 1 answer)
For what values of x, y, and z, including NULL, does the Boolean expression x<=100 AND NOT (y>=15 OR z=35 have the truth value UNKNOWN? Identify one of those values from the list below.
A. x = NULL, y=0 z=4.
B. x=-2. y=-2 z=-2 .
C. x=3 y=0 z=7
D. x=2 y=-1 z=6
