Which of the Following Does Not Describe B-Cell Receptors

Which of the following does not describe B-cell receptors?

A) B-cell receptors are membrane-bound and secreted.
B) B-cell receptors consist of a variable region and a constant region.
C) B-cell receptors lack specificity and can bind to a number of different antigens.
D) B-cell receptors possess specificity and can therefore bind only to unique epitopes.
E) B cell receptors undergo affinity maturation as a consequence of somatic hypermutation.