Scanning the Whole Genome of Every Infectious Agent in a Patient

Scanning the whole genome of every infectious agent in a patient sample and comparing that to known genome sequences maintained in libraries would be the most accurate and efficient way to diagnose disease.We are moving closer to this becoming a reality largely because

A) gene libraries have greater accessibility.
B) more people are being trained in high throughput genetic analysis.
C) multiple organisms have the same genome so it will minimize the number of screenings necessary.
D) the cost of high throughput genetic analysis has plummeted in recent years and continues to decrease.