2. Since 2019, the magnitudes of all SI units have been defined by declaring exact numericalvalues for defining constants when expressed in terms of their SI units. Which one of thefollowing constants is not included?
(A) the speed of light in vacuum, c
(B) the Planck constant, h
(C) the Coulomb constant, ke(or 1/4πε0)
(D) the Boltzmann constant, k (or kB)
(E) the Avogadro constant, NA
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Since 2019, the magn☆☆☆☆☆☆ ☆☆ ...