Assertion: `x+y+z-15=0` is the equation of a plane which passes through the midpoint of the ine

Assertion: `x+y+z-15=0` is the equation of a plane which passes through the midpoint of the ine segment joining te points (2,3,4) and (6,7,8). Reason: The mid point (4,5,6) satisfies the equation of the plane. (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not te correct explanation of A (C) A is true but R is false. (D) A is false but R is true.