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The gravitational force between a \( \mathrm{H} \)-atom and another particle of mass \( m \) will be given by Newton's law:
\( \mathrm{P} \) \( F=G \frac{M . m}{r^{2}} \), where \( r \) is in \( \mathrm{km} \) and

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(a) \( M=m_{\text {proton }}+m_{\text {electron }} \).
(b) \( M=m_{\text {proton }}+m_{\text {electron }}-\frac{B}{c^{2}}(B=13.6 \mathrm{eV}) \).
(c) \( M \) is not related to the mass of the hydrogen atom.
(d) \( M=m_{\text {proton }}+m_{\text {electron }}-\frac{|V|}{c^{2}}(|V|= \) magnitude of the potential energy of electron in the \( \mathrm{H} \)-atom).
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