(B) The cork cambium $(phellogen)$,the cork $(phellem)$,and the secondary cortex $(phelloderm)$ are collectively known as the $periderm$.$Phellem$ is

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(B) The cork cambium $(phellogen)$,the cork $(phellem)$,and the secondary cortex $(phelloderm)$ are collectively known as the $periderm$.$Phellem$ is formed on the outside,while $phelloderm$ is formed on the inside by the $phellogen$.$Periderm$ acts as a secondary protective tissue in plants.