Suppose you created an array named Rates, which contains $20$ cells each of which holds a float value. Which of the following statements' which successfully store $3\mathrm{.}4$ in the $4$th cell of the array? $q,$

$4$ Rates $=3\mathrm{.}4$;

Rates $+3=3\mathrm{.}4f$

Rates$[3]=3\mathrm{.}4f$;

$3\mathrm{.}4=$Rates$[3]$