Q.35 Geometrical isomer (text Q3.6)

Which of (a) to (e) is the concise structural formula of 1,3-diburomo-2-butene?
(a) CH3CBr=CHBr, (b) CH3CH2CH=CH2, (c) CH3CBr=CHCH2Br,
(d) CH3CH=CHCH3, (e) CH3CH=C(CH3)2