この本は貸し出し中です What is the meaning of "中" in this?

Question

この本は貸し出し中です

I don't know if i should understand :

Is it "not available", because it is in the "the process of~" being already loaned to somebody else?

Or is it "to be available for loan"?

And あの本は貸し出し中です is read like かしだしちゅう or なか?

Thanks!

Answer 1

It means that the book is on loan (to someone) and therefore, it is not available.

「中」 is always read 「ちゅう」 for this meaning.