A signal with ± 10 V ranged and 1 KHz band width is being digitized using a sample and hold circuit and a 10 bit quantizer. The quantization step is :

• A. 1 x 10-9 V
• B. 5 x 10-9 V
• C. 2.5 x 10-9 V
• D. 0.5 x 10-9 V