You Have Been Given DNA from a Crime Scene That

You have been given DNA from a crime scene that needs to be sequenced in order to identify the perpetrator. Which techniques below do you need to carry out to accurately sequence the DNA?

A) Different sized fragments of DNA are made ending in the same base.
B) Gel electrophoresis separates different sized fragments for each base.
C) Blottings of the DNA fragments are stained with a dye.
D) Fluorescent tagging for each base reveals a ladder of the sequence.