Which of the Following Best Describes a Procedural Difference Between

Which of the following best describes a procedural difference between homogeneous and heterogeneous immunoassays?

A) There is no physical separation of bound from free fractions in a homogeneous immunoassay whereas in a heterogeneous immunoassay you must separate bound forms from free forms.
B) A homogeneous immunoassay usually takes longer to perform because you must physically separate the bound from free fractions whereas in a heterogeneous immunoassay the time to perform the assay is shorter because you do not have to separate bound forms from free forms.
C) There is a physical separation of bound from free fractions in a homogeneous immunoassay.
D) Separation of bound and free fractions is optional for either type of immunoassays.