What should a developer use to post a message on chatter when a picklist field called status__c on a custom object applicatton__c is set to "approved"?

Explanation:

Chatter is a social networking platform that allows business employees, partners and customers to produce and communicate in a secure social environment.

To post a message on Chatter, the developer should do the following :

• Using  Workflow Rule and use the "Post to Chatter" action when records meets the criteria.

• Using streaming API to post in Chatter.

• Using ConnectApi from Scheduled Apex.

• Using a Process Builder to post in Chatter which meets the required criteria.

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