Which of the following production functions haveconstant returns to scale?

(Here,Y= output,K= capital,H= high-skill labor, andL =low-skill labor)

• A.

Y=K(H+L)

• B.

Y=H(K+L)

• C.

Y=K+L+H

• D.

Y=K+H+L

• E.Both A and B
• F.Both B and C
• G.Both A and C
• H.Both B and D
• I.Both A and D