Write the systematic name for the following polyene.

(3Z,5Z)-3-chloro-6-bromohepta-1,3,5-triene

(3E,5E)-6-bromo-3-chlorohepta-1,3,5-triene

(3Z,5Z)-6-bromo-3-chlorohepta-1,3,5-triene

(2Z,4Z)-2-bromo-5-chlorohepta-2,4,6-triene