What are two capabilities of Schema Builder? Choose 2 answers

Universal Containers uses a custom picklist called Account_Region__c on the Account object. The vice president of sales has asked that the value of this field is visible on Opportunities.
How should an app builder create this solution?

DreamHouse Realty requires that field value changes for certain fields such as Asking_Price__c and Real_Estate_Agent__c on their House__c custom object show up prominently on Chatter.
What Chatter feature should the app builder utilize?

What is a use case for validation rules?

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