A plasma cell
a. secretes antibodies.
b. circulates as a T cell until it is exposed to its specific antigen.
c. circulates as a B cell until it is exposed to its specific antigen.
d. secretes antibodies and circulates as a T cell until it is exposed to its specific antigen.
e. secretes antibodies and circulates as a B cell until it is exposed to its specific antigen.



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