In Buerger’s disease, which of the following are true?

In Buerger’s disease, which of the following are true?
a) There is a strong association with cigarette smoking
b) Raynaud’s phenomenon occurs in 30% of cases
c) The upper limbs are more frequently affected than the lower limbs
d) Migratory thrombophlebitis is an associated feature
e) There is typically tapered narrowing of the occluded artery