What Is the Difference in the Bonding Between Alpha-Helix and Beta

What is the difference in the bonding between alpha-helix and beta sheets?

A) Hydrogen bonding between the amides only occurs in one of these two types of secondary structures.
B) Hydrogen bonding occurs between the amides of adjacent chains in the sheets instead of between the amides in different parts of the helices.
C) Sulfur bridges allow the spring like turns in alpha helices and van der Waals dispersion allows the folds in beta sheets.
D) Hydrogen bonding always occurs in the alpha helices but only occurs in parallel beta sheets.