Which of the following molecules have non-zero dipole moments ?
(I) Gauche conformation of 1, 2 -dibromoethane
(II) Anti conformation 1,2-dibromorthane
(III) Trans-1,4 -dibromocyclohexane
`(IV) Cis-1, 4-dibromocyclohexane
(V) Tetrabromomethane
(VI) Dibromocychexane
A. I and II
B. I and IV
C. II and IV
D. I,IV and Vi