Which of the following product is formed when ethanol is oxidized by a strong oxidizing agent?

$\mathrm{CH}_{3} \mathrm{CHO}$

$\mathrm{CH}_{3} \mathrm{COOH}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OOCCH}_{3}$

$\mathrm{CH}_{3} \mathrm{CH}_{3}$