What is a key structural difference between single and multiple beta strands?

• A. Single beta strands are depicted as loops, while multiple strands are depicted as arrows.
• B. Single beta strands are depicted as arrows, while multiple strands are depicted as loops.
• C. Single beta strands are depicted as narrow arrows, while multiple strands are depicted as broad arrows.
• D. Single beta strands are depicted as broad arrows, while multiple strands are depicted as connected broad arrows.

Answer: (D)