Um, I hate to be a dissenter, but . . . In men's NCAA rules, that 4th spot is NOT available to anyone--it must be left empty. I don't have my book in front of me, but I'm certain (not that I've never been wrong when I've been certain) that this year's rules specify that situation. In women's NCAA, as was stated, the 3rd defensive player can occupy either spot. The intent (in men's) is apparently to make "boxing out" contact with the shooter less likely, or at least less immediate.
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