Typical problems in Newton's 2nd and 3rd Laws that are difficult for beginners

Complete the following questions for the 3 cases (see pictures)
(a) Identify the forces acting on A and B separately even if they are interacting
(b) Identify which pairs of forces that are a consequence of Newton' 3rd Law.
(c) Calculate the magnitude and indicate the direction of all the forces on A and B separately
(d) Calculate any forces on the rope if applicable