A Gene That Contains Introns Can Be Made Shorter (But

A gene that contains introns can be made shorter (but remain functional) for genetic engineering purposes by using

A) RNA polymerase to transcribe the gene.
B) a restriction enzyme to cut the gene into shorter pieces.
C) reverse transcriptase to reconstruct the gene from its mRNA.
D) DNA polymerase to reconstruct the gene from its polypeptide product.
E) DNA ligase to put together fragments of the DNA that codes for a particular polypeptide.