Consider the following statements concerning proteins
I. All natural amino acids which are constituents of proteins, are `alpha`-amino acids.
II. `alpha`-Amino acids are all optically active and have L-configuration.
III. `alpha`-Amino acids are connected by ester linkages.
IV. Favourable conformation for the peptide linkages in protein is the `alpha`-helix arrangement.
Of these statements

Options

A. I and II are correct
B. II and III are correct
C. I and IV are correct
D. I, II, III and IV are correct

Answer

C

Explanation

I and IV are correct