$VNTRs$ are

Nowadays,it is possible to detect the mutated gene causing cancer by allowing a radioactive probe to hybridize with its complementary $DNA$ in a clone of cells,followed by its detection using autoradiography because:

The sensitivity of $DNA$ fingerprinting can be increased by using ..........

In $DNA$ fingerprinting,which of the following is true?

Select the correct sequence for the process of $\text{VNTR}$ technique.
$X =$ Hybridisation using labelled $\text{VNTR}$ probe
$Y =$ Digestion of $\text{DNA}$ by restriction endonucleases
$Z =$ Transferring (blotting) of separated $\text{DNA}$ fragments to synthetic membrane,such as nitrocellulose

Select the incorrect statement.