What type of field can be used to filter a Report Chart that has been added to a Page Layout?

Which sandbox is used for performance testing?

For an external object relationship, you can create a lookup relationship.
What type of object(s) can be the parent?

If any of the triggered workflow rules result in another field update that's also enabled for workflow rule re- evaluation, a domino effect occurs, and more workflow rules can be re-evaluated as a result of the newly- triggered field update.

An Alexa Skill Builder wants to customize a welcome back message for each person who uses the skill. The JSON input is shown below:

Which element from the request would the Builder use to accomplish this?