Assertion (A): X and Y Independently Intending to Kill Z

Assertion (A) : X and Y independently intending to kill Z strike him with iron rod on his head. Z dies as a result of the injuries. Both X and Y are guilty of murder under Section 302/304, Indian Penal Code. Reason (R) : When a criminal act is done by several person in furtherance of common intention of all, each of them is liable as if it was done by him alone.Of the above statements.

A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true and R is NOT a correct explanation of A
C) A is true but R is false
D) A is false but R is true.