Which of the following statements are correct about the Arrhenius equation?

When Ea is zero, rate is independent of temperature

The Arrhenius constant becomes equal to rate constant at a very high temperature

Positive catalyst increases ${\mathrm{E}}_{\mathrm{a}}$of the reaction

${\mathrm{e}}^{-\mathrm{E}}{\mathrm{a}}^{/\mathrm{RT}}$ represents the fraction of molecules having energy more than threshold energy