What is described by the primary structure of a protein? Identify the type of bonds or molecular interactions that stabilize the structure.

The primary structure is the overall three-dimensional shape of the protein stabilized by covalent or noncovalent side-chain interactions.

The primary structure is the sequence or order of amino acids in a protein chain held together by peptide bonds.

The primary structure is the organization of subunits to form a more complex protein unit held together by covalent or noncovalent interactions.

The primary structure is the spatial arrangement of the peptide backbone stabilized by hydrogen bonds.