The voltage ranges for a logic high and a logic low in RS-232 C standard is

A

Low is 0.0 V to 1.8 V, High is 2.0 V to 5.0 V

B

Low is -15.0 V to -3.0 V, High is 3.0 V to 15.0 V

C

Low is 3.0 V to 15.0 V, High is -3.0 V to -15.0 V

D

Low is 2.0 V to 5.0 V, High is 0.0 V to 1.8 V