Question

How should your knees be positioned in good standing posture?
A. Slightly bent
B. As rigid as possible
C. Slightly abducted
D. Slightly adducted

Answer 1

Well if dealing with an posture you would either make a slightly bent knee to get in an current position where you are suppose to be so I would say to have your knee slightly bent for your position :) hoped I helped  

Answer 2

A. slightly bent. if the knees aren't bent, you could literally faint.