Final answer:
TI antigens, or T-independent antigens, are antigens that can stimulate an immune response without the help of T cells. Bacterial cell wall components and Capsular polysaccharides are examples of TI antigens.
Step-by-step explanation:
TI antigens refer to T-independent antigens, which are antigens that can stimulate an immune response without the help of T cells.
Out of the options given, both Bacterial cell wall components and Capsular polysaccharides can be characterized as TI antigens. These antigens can directly activate B cells without the need for T cell help.
Therefore, the correct answer is D. Both B and C.