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Answer: Option 3
Since, phase rule is $$f\left( {{\text{degree of freedom}}} \right) = C - \emptyset + 2$$ Where, $$C=$$ number of components, $$\emptyset = $$ number of phases, $$ \Rightarrow \emptyset = C - f + 2$$ So for maximum phases $$f$$ should be minimum $$f$$ cant be negative since it denotes number of variables hence $$f = 0$$ So, $$\emptyset = C + 2$$ Given $$C = X \Rightarrow \emptyset = X + 2$$
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