For rotation about the C-3--C-4 bond of 2-methylhexane: a. Draw the Newman projection of the most stable

Question:

For rotation about the C-3--C-4 bond of 2-methylhexane:
a. Draw the Newman projection of the most stable conformer.
b. Draw the Newman projection of the least stable conformer.
c. About which other carbon-carbon bonds may rotation occur?
d. How many of the carbon-carbon bonds in the compound have staggered conformers that are all equally stable?