How is a graft made?

(a) By surgically connecting two arteries

(b) By externally connecting two veins

(c) By surgically placing a connection between two capillaries

(d) By surgically placing a connection between an artery and vein

The question was posed to me in quiz.

My doubt is from Intravenous Cannulae, Stomach Wash Tubes, Infusion Pumps v/s Syringe Pumps topic in portion Gastroenterology of Clinical Science

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