Indicate Whether Each of the Following Descriptions Applies to Transformed

Short Answer

Indicate whether each of the following descriptions applies to transformed cell lines (T), nontransformed cell lines (N), or both (B). Your answer would be a four-letter string composed of letters T, N, and B only, e.g. BBNN.
( ) They can be thawed and recultured after long-term storage in liquid nitrogen.
( ) They often grow only when attached to a surface, such as that of a culture dish.
( ) They proliferate to very high densities.
( ) They usually cause tumors when injected into immunocompromised animals.