Assertion (A) : $\text{Zn}\left(\text{s}\right)+{\text{CuSO}}_4\left(\text{aq}\right)\to {\text{ZnSO}}_4\left(\text{aq}\right)+\text{Cu}\left(\text{s}\right)$ is an oxidation reaction

Reason (R) : A reaction in which oxidation and reduction takes place simultaneously is called redox reaction.