**Correct option (B)(D)**

**Explanation:**

∴ third side will be parallel to bisectors of two given line

∴ Bisectors are 7x - y + 3/5√2 = ±(-x - y + 3)/√2

∴ Bisectors are 3x + y - 1 = 0 and x -3y + 9 = 0

Now required third side will be parallel to these bisectors

∴3x + y + 7 = 0 or x - 3y - 31 = 0