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Intercalated discs are found in which type of muscle?

a) Skeletal - multinucleated, cardiac - single nucleus, smooth - no nucleus
b) Skeletal - single nucleus, cardiac - single nucleus, smooth - single nucleus
c) Skeletal - multinucleated, cardiac - single nucleus, smooth - single nucleus
d) Skeletal - multinucleated, cardiac - multinucleated, smooth - no nucleus