Which of the following formulas is used to determine approximate number of classes?

Group of answer choices

K $=3\mathrm{.}33+$ logn$(10)$

K $=1+3\mathrm{.}33$ log$10$

K $=1+3\mathrm{.}33$ log$($n$)$

K $=1+3\mathrm{.}33$ logn$(10)$