Which of the following is the correct way for adding EJS to the apps view engine?

app.set$(\text{'}$view engine', $\text{'}$html$\text{'})$;

app.set$(\text{'}$views$\text{'},$ path.join$(\_\_$dirname, 'views'$)$;

app.engine$(\text{'}.$html$\text{'},$ require$(\text{'}$ejs$\text{'}).\_\_$express$)$;

None of the aboveindOneAndRemove, findOneAndReplace, mapReduce, and deleteMultiple