Choose the most important $($between $2$ & $4)$ elements of digital marketing for your business and explain how they support your operations.

$-$Content marketing$$

$-$Social media marketing $$

$-$E$-$mail marketing $$

$-$Mobile marketing $-$Affiliate marketing$-$Search engine marketing $($SEM$)$

$-$Search engine optimization $($SEO$)$

$-$Display advertising