Where can a custom button be placed? Choose 3 answers

An App Builder has been asked to integrate Salesforce with an external web service. The web service must be notified every time an Opportunity is Won. Which two can satisfy this requirement?

The appraisal team at DreamHouse Realty wants to leverage Salesforce mobile app.
What are three things an app builder should do to optimize mobile experience?
Choose 3 answers

Universal Containers has a workflow on opportunity that will change the status field to "In Progress" when the Stage field is changed "Negotiation." In addition, there is a validation rule on Status that will prevent the status being set to "In Progress" if the amount of the opportunity is less than $10,000.A user named Frank does not have FLS to see status. When Frank changes opportunities to a stage of "Negotiation" the status is still being changed to "In Progress", why is this occurring?

Universal Containers (UC) has a custom Invoice object and a custom Invoice Line Item object. TTie Invoice Line Item object has a lookup relationship to the Invoice. UC would like to convert the lookup relationship to a master-detail relationship but is unable to do so.
Which two reasons could be preventing this relationship conversion?
Choose 2 answers