In blue-white screening, what do blue colonies represent?

cells that have not taken up the plasmid vector
cells with recombinant plasmids containing a new insert
cells containing empty plasmid vectors
cells with a non-functional lacZ gene

The blue-white screen is a technique which involves the rapid identification of the recombinant bacteria in a vector-based molecular cloning experiment. In this method, a DNA ligated vector is inserted in a host cell which is viable for transformation and grown in presence of X-gal.

The cells that are transformed with the vectors having the recombinant DNA produce the white colonies. Whereas, the cells transformed with empty vector i.e. the non-recombinant plasmids, produce the blue colonies.

In blue-white screening, what do blue colonies represent? cells that have not taken up the plasmid vector cells with recombinant plasmids containing a new insert cells containing empty plasmid vectors cells with a non-functional lacZ gene

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In blue-white screening, what do blue colonies represent?

cells that have not taken up the plasmid vector
cells with recombinant plasmids containing a new insert
cells containing empty plasmid vectors
cells with a non-functional lacZ gene