What is the direction of the resultant vector if two vectors having equal length is placed in the Cartesian plane at the origin as, one being parallel to and heading towards positive x-axis and the other making 165 degree with it and heading in the opposite direction of that of the first one?

• A. It is either in the 1st quadrant or in the 2nd quadrant
• B. It is either in the 1st quadrant or in the 3rd quadrant
• C. It is either in the 1st quadrant or in the 4th quadrant
• D. Only in the 1st quadrant