Correct option is (B) - 4
Explanation :
Let E1 = 0 and E2 = 0 be the given two planes and E = 0 be the required plane. Since E = 0 passes through the line of intersection of E1 = 0 and E2 = 0,
This is perpendicular to the plane x + y + z − 1 = 0.
Therefore
Hence, k = − 4