Final answer:
Marketo uses the email address as the primary attribute for automatically de-duplicating records. This attribute is chosen because email addresses are unique to individuals, which ensures the accuracy of the database by preventing duplicate entries.
Step-by-step explanation:
Marketo is designed to help with marketing automation and has certain features for managing records within its database. One essential feature is how Marketo handles duplicates. It is programmed to de-duplicate records based on specific attributes, ensuring that each record within the database is unique and prevents unnecessary redundancy that could complicate marketing campaigns and data analysis.
Regarding the attribute used for de-duplication, Marketo automatically de-duplicates records based on the C. Email address. This means that when new records are introduced into the system, Marketo checks the email address against existing records to determine if an entry is unique or a duplicate. An email address is a unique identifier because it is highly unlikely for two different individuals to share the same email address, making it a reliable attribute for de-duplication purposes.