The d.r. of normal to the plane through $(1,0,0),(0,1,0)$ which makes an angle $\pi / 4$ with plane $x+y=3$ are

• A

  $1, \sqrt{2}, 1$
• Correct answer
  B

  $1,1, \sqrt{2}$
• C

  $1,1,2$
• D

  $\sqrt{2}, 1,1$

Hence, the correct answer is option: 'B'.