I encourage anyone reading this to review this document detailing the scope of the investigation. https://www.justice.gov/opa/press-release/file/967231/download
It is the enabling element detailing the scope of the investigation. It states Mueller is authorized to conduct the investigation and then lists three specific things. Those things are the ones I itemized in my prior post.
Please understand the letter of of the authorization trumps June’s self-serving interpretation of the “spirt” of the authorization.