Q. The genome-wide comparative mRNA expression profile between normal and cancer cells can be studied using the microarray technology. The basic approach of this technology is

• (A) Hybridization of fluorescently labelled genomic DNA from human cells to normal and cancer cell cDNA immobilized onto two glass slides
• (B) Hybridization of fluorescently labelled cDNAs from normaland cancer cells to a single glass slide containing immobilized clones of human genomic DNA
• (C) Hybridization of fluorescently labelled cDNAs from normal and cancer cells to a single glass slide containing immobilized clones of human cDNAs
• (D) Hybridization of fluorescently labelled genomic DNA from normal and cancer cells to immobilized human cDNAs on a single glass slide