Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Oligosaccharides with unique structures are components of a variety of glycoproteins and glycolipids on the outer surface of plasma membranes.
Reason R: The influenza virus infects animal cells by binding to the cell surface glycoproteins as first step of infection.

In the light of the above statements, choose the correct answer from the options given below: