Skin Lesions

An additional staging procedure is a Sentinal Node Biopsy, what is this?

Identification and removal of the closest lymph node group to the site of the melanoma
Identification and removal of all the lymph nodes in the same region as the melanoma
Identification and removal of the first draining lymph node from the melanoma site
Identification and removal of the first draining group of lymph nodes from the melanoma site

Please answer each row

Well done, correct.