$AB$ is a boundary separating two media of different refractive indices. $A$ ray is incident on the boundary and is partially reflected and partially transmitted. Choose the $\text{CORRECT}$ statement.

• A
  $3$ is incident ray and $1$ is refracted ray
• B
  $2$ is incident ray and $1$ is partially reflected ray
• C
  $1$ is incident ray and $3$ is refracted ray
• D
  $3$ is incident ray and $2$ is partially reflected ray