There are 6 vectors: a, b, c, d, e, f. Simply the following expression: [ a(b . c) X (e . f)d ] X [ a – d ].‘X’ represents cross product while ’.‘ represents dot product. Vectors a & d are perpendicular.

There are 6 vectors: a, b, c, d, e, f. Simply the following expression

1.	There are 6 vectors: a, b, c, d, e, f. Simply the following expression: [ a(b . c) X (e . f)d ] X [ a – d ].‘X’ represents cross product while ’.‘ represents dot product. Vectors a & d are perpendicular.
A.	0
B.	(b . c)(e . f) [ d + a ]
C.	(b . c)(e . f) [ d – a ]
D.	(b . c)(e . f) [ d X a ]
Answer» C.