4. What do ending diagonals, truncated fi fth waves, and fi fth-wave extensions have in common?

(A) Th ey always move to the downside, which is a faster move.

(B) Th ey are extended waves, which off er more profi t opportunities.

(C) Th ey are all followed by a swift and sharp reversal.

(D) Th ey are all impulse waves.