Which of the following proteins can be classified as immunoglobulins? i) t cell receptors ii) b cell receptors iii) antigens?

The B-cell receptor (BCR)  is composed of immunoglobulin molecules that form a type 1 receptor protein, which is usually located on the outer surface of B cells. The immunoglobulin is part of the B cell receptor (BCR), which allows a B cell to reveal when a specific antigen is present in the body and triggers B cell activation.

Your answer is a because that is true

Since we don't see a strand; i got answers off a sheet and the correct answer is "2".