A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?

• The output of the gate appears to be open.
• The dim indication on the logic probe indicates that the supply voltage is probably low.
• The dim indication is a result of a bad ground connection on the logic probe.
• The gate may be a tristate device.