Universal Containers (UC) has Salesforce integrated with their mainframe system. All the orders placed in Salesforce are sent to the mainframe system in a nightly batch process.
Which two capabilities are required for middleware to support this integration?

Which two statements are correct about External ID?
Choose 2 answers

A company is planning on sending orders from Salesforce to a fulfillment system. The integration architect has been asked to plan for the integration.
Which two questions should the integration architect consider?
Choose 2 answers

UC leverages customer MDM as a source of truth. The requirement is to dedupe and store any account or contact created in MDM before the same is created in Salesforce. This ensures data is clean and not duplicated in Salesforce. During peak season, users experience a "Concurrent Request Limit Exceeded" error.
What is the recommended solution?

Northern Trail Outfitters (NTO) has an integration set up between a Salesforce org and a quoting system. NTO would like to show a notification to all sales representatives that use Salesforce anytime the quoting system will be taken down for maintenance.
Which Salesforce API should an Integration Architect use to fulfill this requirement?