9C07 D
 Using positive logic, a TTL IC will recognize the following voltages levels as valid "1" and "0" levels in an operational logic circuit:
A. Binary 0 = +0.4 VDC, Binary 1 = +3.6 VDC.
B. Binary 0 = 0.0 VDC, Binary 1 = +5.0 VDC.
C. Binary 0 = +0.3 VDC, Binary 1 = +4.7 VDC.
D. All of these.
