$\begin{array}{1 1} \text{F=2.1 N, vertically outwards to the plane of paper } \\ \text{F=2.1 N, vertically inwards to the plane of paper } \\ \text{F=2.1 N, along the surface to the right side of the paper } \\ \text{F=2.1 N, along the surface to the left side of the paper } \end{array} $