Let \( \sum_{\mathrm{k}=1}^{10} f(\mathrm{a}+\mathrm{k})=16\left(2^...

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Let \( \sum_{\mathrm{k}=1}^{10} f(\mathrm{a}+\mathrm{k})=16\left(2^{10}-1\right) \), where the function
P \( f \) satisfies \( f(\mathrm{x}+\mathrm{y})=f(\mathrm{x}) f(\mathrm{y}) \) for all natural numbers \( \mathrm{x}, \mathrm{y} \) and

W. \( f(1)=2 \) then the natural number ' \( a \) ' is
[JEE Main-2019 (April)]
(a) 4
(b) 3
(c) 16
(d) 2
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