There are four Boolean variables x1, x2, x3 and x4. The following functions are defined on sets of themf (x3, x2, x1) = m (3, 4, 5) g (x4, x3, x2) = m (1, 6, 7) h (x4, x3, x2, x1) = fg Then h (x4, x3, x2, x1) is

There are four Boolean variables x1, x2, x3 and x4. The following func

1.	There are four Boolean variables x1, x2, x3 and x4. The following functions are defined on sets of themf (x3, x2, x1) = m (3, 4, 5) g (x4, x3, x2) = m (1, 6, 7) h (x4, x3, x2, x1) = fg Then h (x4, x3, x2, x1) is
A.	m (3, 12, 13)
B.	m (3, 6)
C.	m (3, 12)
D.	0
Answer» B. m (3, 6)