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Question

Pick out true statements from the following :
(a) The rest mass of photon is zero
(b) π -meson in nuclear field is analogous to photon in electromagnetic field
(c) Neutral π -meson decays into two γ -ray photons
(d) Graviton of gravitational field has an integral spin

A
a,c and d
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B
a and b
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C
a,b,c and d
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D
a,b and d
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