thx for help and with detailed explanation please

Eight charges of amount 1 milli-coulomb are placed at the corners of a cube having a side of dimension 1 metre. A test charge of amount 0.1 milli-coulomb is placed at the centre of one of the faces. What is the magnitude of the force experienced by the test charge? Select one or more: O a. 2.0021 KN O b. 1.96 kN O c. 1.4657 KN O d. 1.8943 kN O e. 2.7843 kN