When comparing domains and structural motifs,which of the following is NOT true?

A)Motifs are found in secondary structures,while domains are found in tertiary structures.
B)Helices are observed in motifs and domains.
C)Structural domains appear in different proteins with similar functions,while structural motifs have been less conserved over evolution.
D)A domain may be repeated in the same protein,but multiple copies of the same motif are rare.