If $x=a$ and $y=b$ is the solution of the equations $x-y=2$ and $x+y=4,$ then the values of $a$ and $b$ are,respectively:

  • A
    $3$ and $1$
  • B
    $3$ and $5$
  • C
    $5$ and $3$
  • D
    $-1$ and $-3$

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