Which of the following meristems is responsible for extrastelar secondary growth in dicotyledonous stem

Which of the following meristems is responsible for extrastellar secondary growth in dicotyledonous stem?

A meristem respondible for extra-stelar secondary growth in dicot stem is

The meristem responsible for extra stelar secondary growth in dicot stem is

The meristem responsible for extrastelar secondary growth in shoot stem is

secondary Growth in dicot stems

The total product of extrastelar secondary growth in dicot stem.

Which meristem is responsible for secondary growth in dicots ? Mention its types .