More Than One Active Input to an Encoder Will Often

More than one active input to an encoder will often produce an erroneous output. This problem may be partially overcome by the use of:

A) an open- collector NAND gate whose inputs are connected to the decoder's outputs.
B) an additional encoder whose inputs are cascaded to the original decoder's outputs.
C) a priority encoder to ensure that when more than one input is active the output will correspond to the lowest- numbered input.
D) a priority encoder to ensure that when more than one input is active the output will correspond to the highest- numbered input.

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