Which tool allows a developer to send requests to the Salesforce REST APIs and view the responses?

A developer needs to create a custom visualforce button for the opportunity object page layout that will cause a web service to be called and redirect the user to a new page when clicked. Which three attributes need to be defined in the <apx:page> tag of the visualforce page to enable this functionality?

What is a good practice for a developer to follow when writing a trigger? (Choose 2)

What are two use cases for executing Anonymous Apex code? Choose 2 answers

A developer needs to find information about @futuremethods that were invoked.
From which system monitoring feature can the developer see this information?