Consider the following statements with regard to inverters
1. Line commutated inverters can function as isolated ac sources
2. Force commutated inverters can provide independent ac voltage with adjustable voltage and frequency
3. Thyrister based inverters do not require additional circuitry for commutation
4. IGBT, PMOSFET based inverters are more reliable, less costly and less complex.
The correct statements are
C) 2,4 D) 1,4