In the context of immune response, which of the following best describes the role of macrophages in activating T cells?

Macrophages directly kill pathogens without interacting with T cells.

Macrophages present antigens on MHC Class II molecules to helper T cells and require co-stimulatory signals for T cell activation.

Macrophages release antibodies to neutralize pathogens.

Macrophages activate T cells by releasing cytokines without presenting antigens.