Express each of the three forces acting on the support in Cartesian vector form and determine the magnitude of the resultant force and its direction, measured clockwise from the positive ( x ) axis.

a) ( F_resultant = √F₁² + F₂² + F₃², θ = arctan(F₂/F₁ + F₃/F₁) )
b) ( F_resultant = √F₁² + F₂² + F₃², θ = arctan(F₂/F₁ - F₃/F₁) )
c) ( F_resultant = √F₁² + F₂² + F₃², θ = arctan(F₁/F₂ + F₃/F₂) )
d) ( F_resultant = √F₁² + F₂² + F₃², θ = arctan(F₁/F₂ - F₃/F₂) )