Final answer:
The indirect ELISA is a common screening test that detects antibodies in serum by attaching a known antigen to the well of a microtiter plate. The color development indicates the presence of the antibody.
Step-by-step explanation:
The correct option about the indirect ELISA is: c. Color Development Indicates Absence of Antibody. Indirect ELISA is a common screening test for detecting antibodies in serum. It is used to detect specific antibodies in patient serum by attaching a known antigen to the well of a microtiter plate. In this test, the color development indicates the presence of the antibody.