Recently, scientists observed the merger of giant ‘blackholes’ billions of light-years away from the Earth. What is the significance of this observation

(a)

Higgs boson particles’ were detected.

(b)

Gravitational waves’ were detected.

(c)

Possibility of inter-galactic space travel through ‘wormhole’ was confirmed.

(d)

It enabled the scientists to understand ‘singularity’.