Given below are two statements :
Statement $I$ : $S_N2$ reactions are 'stereospecific',indicating that they result in the formation of only one stereo-isomer as the product.
Statement $II$ : $S_N1$ reactions generally result in the formation of product as racemic mixtures.
In the light of the above statements,choose the correct answer from the options given below :

• A
  Statement $I$ is true but Statement $II$ is false
• B
  Statement $I$ is false but Statement $II$ is true
• C
  Both Statement $I$ and Statement $II$ are true
• D
  Both Statement $I$ and Statement $II$ are false