Which of the following statements is correct regarding the universal gravitational constant $G$?

$G$ has different value in different system of units.
In $SI$ system the value of $G$ is $6.67\times {10}^{-11} N{m}^{2}k{g}^{-2}$ whereas in $CGS$ its value is $6.67\times {10}^{-8} dyne c{m}^2{g}^{-2}$.
The value of $G$ is same throughout the universe.
The value of $G$ was first experimentally determined by English scientist Henry Cavendish.
$G$ is a scalar quantity