Which of the following stars is also known as Pulsar?

Neutron Star

The correct answer is Option (3) - Neutron Star

Most neutron stars are observed as pulsars. Pulsars are rotating neutron stars observed to have pulses of radiation at very regular intervals that typically range from milliseconds to seconds. Neutron stars are ancient remnants of stars that have reached the end of their evolutionary journey through space and time. These interesting objects are born from once-large stars that grew to four to eight times the size of our own sun before exploding in catastrophic supernovae.