Use a table to express the values of each of these Boolean functions

Use a table to express the values of each of these Boolean functions.
a) F(x, y, z) = z̅
b) F(x, y, z) = x̅y + y̅z
c) F(x, y, z) = xy̅z + (x̅y̅z̅)
d) F(x, y, z) = y̅(xz + x̅z̅)