Using the Clark scale, which level is used to classify MM that has spread into the subcutaneous tissue?

Question

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Clark's levels are used to classify thin tumors in terms of how deep the cancer has spread into the skin. Tumors may be confined to the epidermis (Clark's level I), spread into different depths of the dermis (Clark's levels II, III, and IV), or spread into subcutaneous tissue (Clark's level V).

Using the Clark Scale, Which Level Is Used to Classify