Read the passage and answer the question.

A junction diode cannot be used for amplification so another type of semiconductor device, a transistor, is used. It is a three section semiconductor with three sections being the emitter, the collector and the base. Common emitter characteristics of a transistor are graphs that are obtained between voltage and current, when emitter is earthed, base is used as input terminal and collector as the output terminal.

Which of the following is true for input characteristics ?

These are graphs between Base Voltage and Base Current keeping Collector Voltage constant.

The input characteristics of a device are the graph between input voltage and input current keeping the output voltage constant.