Which two are capabilities of Schema Builder? (Choose two.)

Universal Containers has created two custom objects called Seminars and Attendees. Organization-wide defaults for these objects have been set to Private. Universal Containers wants to set up a new junction object between these custom objects. A select group of users should be able to edit records in the junction object.
Which two steps should an app builder take to configure the proper security? (Choose two.)

Universal container needs to update a field on an account when an opportunity stage is changed to close lost.
What can be used to accomplish this requirement? Choose 2

In order to delete Opportunities, Universal Containers would like sales reps to submit a request for approval to their sales manager. What can be used to meet these requirements?

Universal Containers has deployed custom tabs to Production via changes sets, without including the profile settings or permission sets.
What is the settings for the visibility of custom tabs?