A Flat Conducting Slab with a Charge Density of 10 $\mu$

A flat conducting slab with a charge density of 10.0 $\mu$ C/m² produces an electric field. The magnitude of the electric field 15 cm from the surface is

A) zero.
B) 0.55 * 10⁶ N/C.
C) 1.1 * 10⁶ N/C.
D) 2.2 * 10⁶ N/C.