Indicate Whether Each of the Following Descriptions Better Applies to Mitogens

Short Answer

Indicate whether each of the following descriptions better applies to mitogens (M), growth factors (G), or survival factors (S). Your answer would be a four-letter string composed of letters M, G, or S only, e.g. GMSG.
( ) They unblock cell-cycle progression
( ) They suppress apoptosis
( ) They trigger a wave of G₁/S-Cdk activity
( ) They inhibit the degradation of cellular macromolecules