Please explain or provide reasoning and response to each prompt of the question below. Please use physics ideas, laws, or equations/formulas to explain to me

Holding a box to the wall. You want to hold a box with mass m to the wall by pressing on it. The coefcient of static friction between the box and the wall is p = 0.4. You apply a force at an angle 6 upward relative to horizontal. (a) Draw a force diagram for the box. (b) What is the force requiIEd to keep the box from falling? (c) Is it easier to push straight against the wall or to push at an angle upward? (d) What is the optimal angle to hold the box up with the least force