The redefined constant for kilogram, which is decided during General Conference on Weights and Measures (CGPM) is ______ ?

1) Boltzmann constant
2) Planck constant
3) Avogadro constant
4) Character constant

Explanation:
On the occasion of World Metrology Day i.e. on 20th May 2019, the world’s scientific and technical community has adopted the resolution to redefine four of the seven base units.