What is the circuit equivalent of the UJT? A diode representing the PN junction of the emitter, a resistance equivalent to the upper part of the ba...

What is the circuit equivalent of the UJT?
A diode representing the PN junction of the emitter, a resistance equivalent to the upper part of the bar, and a fixed and a variable resistance equivalent to the lower part of the bar.
A diode representing the PN junction of the base, a resistance equivalent to the upper part of the bar, and a fixed and a variable resistance equivalent to the lower part of the bar.
A diode representing the PN junction of the collector, a resistance equivalent to the upper part of the bar, and a fixed and a variable resistance equivalent to the lower part of the bar.
A diode representing the PN junction of the emitter, a resistance equivalent to the lower part of the bar, and a fixed and a variable resistance equivalent to the upper part of the bar.

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