Which of the following is correct about agarose gel electrophoresis: a. It has a lower resolving power than polyacrylamide gels. b. Agarose gels must be loaded vertically. c. It is used only to separate DNA fragments. d. To separate DNA fragments by agarose gel electrophoresis, one must load near the anode. e. It is a potent neurotoxin and should be handled with care.