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A Zener diode is designed to operate in the ( ) region of its characteristic curve in the operating condition.

A. forward operating
B. reverse bias
C. reverse breakdown
D. zero voltage

It is best not to leave unused TTL inputs unconnected () because of noise sensitivity. In a TTL NAND gate, there are several alternative ways to handle unused inputs except ( ).

A. tied-together inputs
B. inputs to Vcc
C. inputs to unused output
D. inputs to ground