You are designing a self-service portal for a company.
The portal must meet the following requirements:
✑ Customers must be able to submit and review cases.
✑ Customers must be able to chat with service representatives in near real time.
Allow service representatives to select cases from queues and use knowledge articles to resolve customer concerns.

You need to recommend solutions for the company that do not require custom development.
Which three apps or services should you recommend? Each correct answer presents part of the solution.
NOTE: Each correct selection is worth one point.