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.

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.

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.



Answer: A


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