Read statement a-d. Which two of them have mistakes?
(a) First transgenic buffalo, Rosie produced milk which was human alpha lactalbumin enriched.
(b) Restriction enzymes are used in isolation of DNA from other macromolecules.
(c) Downstream processing is one of the steps of r-DNA technology.
(d) Disarmed pathogen vectors are also used in transfer of r-DNA into the host.

A. b and c
B. c and d
C. a and c
D. a and b