Go ahead, pick two

There are some red balls and some black balls in a bag.

You reach in and grab two balls at random.

The probability that you picked one ball of each color is exactly 0.5.

Which of these numbers is a possible choice for the number of red balls that were originally in the bag?

Clarification: "All of them" and "None of them" refer only to the numerical answers provided, not to each other! (No this isn't a logic question in disguise! ;) )

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