What could be illegal about it? The libero on the court isn't the libero who goes to serve? That just seems like a legal libero exchange to me. (12.2.1.2.1 A libero is allowed to exchange with the other libero whenever the
ball is out of play.)
The second libero goes directly to the service area instead of entering through the sideline? The first libero already served for the regular player that just returned to the court? But the question doesn't say either of those things.
I just don't see what the question is getting at.
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