isomer of 1,3,5-tribromo-2,4,6-trimethylcyclohexane

Consider the all cis isomer of 1,3,5-tribromo-2,4,6-trimethylcyclohexane. a. Draw the molecule as a skeletal structure. b. Draw a sawhorse representation of each of the two possible chair forms. c. Which chair conformation do you expect to be more stable? Briefly explain why