During secondary growth of plants, stem phellogen cuts of cells on both sides. The outer cells gets differentiated into ...$A$... and the inner cells gets differentiated into ...$B$... cortex

Choose the correct combination of $A$ and $B$ with reference to above statement

• A

  $A-$ cork; $B-$ phellem

• B

  $A-$ secondary cortex; $B-$ phelloderm

• C

  $A-$ secondary cortex; $B-$ primary cortex

• D

  $A-$ cork/phellem; $B-$ secondary cortex