Variability in the Immune Response to Cancer Leads to Observations

Variability in the immune response to cancer leads to observations that

A) NK cells and dendritic cells can control cancer cells directly.
B) NK cells and dendritic cells can activate a helper T-cell response to control cancer.
C) NK cells and dendritic cells can activate a cytotoxic T-cell response to control cancer.
D) T<_H17 cells can activate a response to control cancer.
E) All of the answers are correct.