The Secondary Structure of a Protein Is the

The secondary structure of a protein is the

A) configuration of those parts of the chain stabilized by a regular pattern of covalent bonds between C and O groups of the backbone of the chain.
B) configuration of those parts of the chain stabilized by a regular pattern of hydrogen bonds between CO and NH groups of the backbone of the chain.
C) specific order of amino acids in the chain.
D) overall three-dimensional structure of the molecule.
E) overall arrangement of several polypeptide chains into one functional unit.