A company need to retrieve a large number of rows from a DE via the API. Which two solutions would optimize the performance? Choose 2

NTO wants to exclude sending an email at send time to those with a record on the 'Exclude' Data Extension.
The primary key on this data extension is Subscriber Key. How would a developer write the Exclusion Script?

Which encryption methods are supported in file imports? Choose 2.

A developer created an email with AMPscript variable as the subject line. The subject line variable was recently updated, but when testing the email, the wrong subject line continues to appear in the inbox. The developer thinks another, oudated, subject line variable is declared within the email. Where could the outdated variable be located?

NTO puts the word TEST at the beginning of the name for each test emai. Which query would return the subs who were sent those emails?