Which one of the following is NOT an addition of Knowledge v3 over the Legacy Knowledge?

A developer is writing a Visualforce page that queries accounts in the system and presents a data table with the results. The users want to be able to filter the results based on up to five fields. However, the users want to pick the five fields to use as filter fields when they run the page.
Which feature of Apex code is required to facilitate this solution?

Which of the following is NOT a typical method to propose a new standard change?

An administrator would like to know which delegated administrators are actively customizing their organization.
Where can the administrator find this information?

One of the following is NOT a valid option in the "Content type" field in the Content item form.