An Alexa Skill Builder Wants a Skill to Inform the Users

An Alexa Skill Builder wants a skill to inform the users of the number of times they have launched the skill. What approach should the Builder take to track this information?

A) Store and increment a launchCount session attribute. Store and increment a launchCount session attribute.
B) Using the ASK SDK, implement a persistent attribute that is stored and retrieved from Amazon DynamoDB.
C) Perform a scan of the Amazon DynamoDB table for the number of records and count each record as a skill launch.
D) Set up a global variable in the code project that increments each time the code is invoked by Amazon Alexa.