Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A :$ In photoelectric effect,on increasing the intensity of incident light,the stopping potential increases.
Reason $R :$ Increase in intensity of light increases the rate of photoelectrons emitted,provided the frequency of incident light is greater than threshold frequency.
In the light of the above statements,choose the correct answer from the options given below:

• A
  Both $A$ and $R$ are true but $R$ is $\text{NOT}$ the correct explanation of $A$
• B
  $A$ is false but $R$ is true
• C
  $A$ is true but $R$ is false
• D
  Both $A$ and $R$ are true and $R$ is the correct explanation of $A$