please show all work and explanations

4. 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 o voting stock prior to the redemption. C) After the redemption, the shareholder must own less than 80% of his percentage ownership o common stock (voting and nonvoting) prior to the redemption. D) All of the above must be met