$\"\"$

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The value of $\"\"$ .

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The function is $\"\"$ .

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Substitute the value of $\"\"$ in the function $\"\"$ .

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$\"\"$

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$\"\"$ .

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The above statement is true, so the function $\"\"$ is not required function for the value of $\"\"$ . $\"\"$

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The function is $\"\"$ .

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Substitute the value of $\"\"$ in the function $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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The above statement is false, so the function $\"\"$ is required function for the value of $\"\"$ . $\"\"$

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The option B is correct answer.