Applied Mechanics and Graphic Statics
Free body diagram is an

Isolated joint with only body forces acting on it
None of these
Isolated joint with all the forces, internal as well as external, acting on it
Isolated joint with internal forces acting on it

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Applied Mechanics and Graphic Statics
A point subjected to a number of forces will be in equilibrium, if

Two resolved parts in any two directions at right angles are equal
Algebraic sum of the forces is zero
Sum of resolved parts in any two directions at right angles, are both zero
Algebraic sum of the moments of the forces about the point is zero

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