Nadeen runs a website on vegan lifestyle. She wants to spread the word and make more people visit her site to read her recipes and articles. What should she do$?$ Select all that apply.

A$.$ She must post new content on her website regularly.

B$.$ She must increase the number of pay$-$per$-$click advertisements on her website.

C$.$ She must regularly respond to user comments and questions.

D$.$ She must use a secure payment gateway.