Comprehensive and Detailed Explanation:
The correct answer is D - Use a Data Extension Entry Source with an applied filter based on recent member activity.
* Using a Data Extension Entry Source allows direct filtering based on attributes like "recent activity" at the time of journey configuration.
* This method efficiently filters at entry without requiring separate automation processes or manual queries.
#Why others are wrong:
* A: Import Activity would require manual or scheduled imports; unnecessary here.
* B: Query Activity creates additional complexity; Journey Builder filtering is more efficient.
* C: Contact Data Entry Source is used when leveraging Attribute Groups, but it's more complex than necessary for simple recent activity checks.
Exact Extract from Salesforce Official Documentation:
Salesforce Help - Journey Builder Entry Sources:
"A Data Extension Entry Source can include filter criteria to ensure only qualifying contacts enter the journey without requiring pre-segmentation." (Source:https://help.salesforce.com/s/articleView?id=sf.mc_jb_data_extension_entry_source.htm)