Which of the Following Requirements Must Be Met for a Redemption

Which of the following requirements must be met for a redemption to be treated as substantially disproportionate?

A) The shareholder must own less than 50% of the outstanding stock (in terms of voting power) after the redemption.
B) After the redemption, the shareholder must own less than 80% of his percentage ownership of common stock (voting and nonvoting) prior to the redemption.
C) After the redemption, the shareholder must own less than 80% of his percentage ownership of voting stock prior to the redemption.
D) All of the above must be met.