Although they are not required for all site pages, which of the following is a reason to have meta descriptions for important pages?

a$.$

None of these. Meta descriptions are designated by the website's hosting service and should not be altered.

b$.$

Google and other search engines penalize websites that do not have meta descriptions for at least $20\%$ of their pages.

c$.$

If no meta description is available, social media platforms will display the first HTML content for the page when users share it$.$ HTML code does not make for user$-$friendly reading.

d$.$

Google and other search engines cannot rewrite designate meta descriptions. Having them gives marketers complete control over how their pages are displayed in organic search engine rankings.