Give below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Immunoelectrophoresis or RIA is the best method for the quantification of IgE.
Reason R: Ordinary electrophoresis does not identify the subgroups of immunoglobulins IgG, IgA, IgM. IgE.
In the light of the above statements, choose the most appropriate answer from the options given below :