Consider two propositional formulas F$1$ and F$2$ and suppose that there is some interpretation I such that I is a model of F$1$ and I is a model of F$2.$ Which of the following is true $($there may be multiple answers$)....$ F$1$ AND F$2$ must be satisfiable, F$1$ AND F$2$ must be contigent, F$1$ implies F$2,$ F$1$ implies negation F$2$ must be satisfiable