The MMR vaccine is a combination vaccine used against three viruses. Our bodies develop immunity through a series of steps that result in the activation of cytotoxic T cells against virally-infected cells. Place the following steps for T cell activation in the correct order.

First Step to Last Step:

A. A helper T cell binds to the MHC-II protein of an infected dendritic cell.
B. The dendritic cell secretes IL-12 to differentiate the helper T cell into a type 1 helper T cell.
C. Dendritic cells infected with the virus migrate to lymph nodes.
D. Activated cytotoxic T cells undergo clonal expansion.
E. The type 1 helper T cell secretes IL-2 to activate the cytotoxic T cell.
F. Activated cytotoxic T cells self-stimulate and leave the lymph node.
G. A cytotoxic T cell binds to the MHC-I protein of an infected dendritic cell.