Correct Answer - Option 1 : SWR meter
A multimeter or a multitester is an electronic measuring tool that is a combination of several tools in one unit.
It usually includes an ammeter, voltmeter, and ohmmeter.
Digital multimeters are sometimes called DMM too.
Modern multimeters can be used to measure electrical quantities other than current, resistance, and voltage.
The multimeter can make many tests, so it is often called "multitester".
When measuring resistance it acts as an ohmmeter, showing ohms. For volts, it would be a Voltmeter. Sometimes it is called a mixture of things like Volt/ohm meter or VOM.
Most meters can measure volts, amps, and resistance.
The standing wave ratio meter, SWR meter, ISWR meter (current "I" SWR), or VSWR meter (voltage SWR) measures the standing wave ratio (SWR) in a transmission line.
The meter indirectly measures the degree of mismatch between a transmission line and its load.