Q1=-0.1 C is located at the origin. Q2=+0.1 C is located on the positive x axis at x=1.0 m. Which of the following is true of the force on Q1 due to Q2?

a. it is repulsive and directed in the +x direction
b. it is attractive and directed in the +x direction
c. it is attractive and directed in the -x direction
d. it is repulsive and directed in the -x direction