For which of the following use cases are Simple Workflow Service (SWF) and Amazon EC2 an appropriate solution? Choose 2 answers

For which of the following use cases are Simple Workflow Service (SWF) and Amazon EC2 an appropriate solution? Choose 2 answers
A . Using as an endpoint to collect thousands of data points per hour from a distributed fleet of sensors
B . Managing a multi-step and multi-decision checkout process of an e-commerce website
C . Orchestrating the execution of distributed and auditable business processes
D . Using as an SNS (Simple Notification Service) endpoint to trigger execution of video transcoding jobs
E . Using as a distributed session store for your web application

Answer: A, B