Which statement best defines a monoclonal antibody (MAB)?

An antibody produced by clones of a single B cell that recognizes a single epitope on an antigen.

A polyclonal serum preparation used therapeutically containing many different immunoglobulin isotypes collected from multiple donors.

A mixture of antibodies produced by different B cells that together recognize multiple epitopes on the same antigen.

Any laboratory-made antibody that binds to several related antigens with low specificity.