Answer
Draw a line to represent the two carbons that the confirmation is drawn based on. Then add carbons that are connected to the two carbons to form the parent chain. And lastly, add the remaining substituents onto the chain.
Work Step by Step
As shown in the image, the longest carbon chain has 3 carbons, so it's a propane. There are 3 bromines and 3 fluorines on the 1st and 3rd carbons. See image.