Final answer:
Connecting DCM to DV360 is achieved through an API connection, which allows seamless data sharing and campaign management between the two platforms without the need for manual transfers or third-party tools.
So, the correct answer is a) Through an API connection.
Step-by-step explanation:
To connect DCM (DoubleClick Campaign Manager) to DV360 (Display & Video 360), you would use an API connection. This integration allows for seamless data transfer and campaign management between the two Marketing Platform products. An API connection is typically facilitated through the platforms' native integration options, designed to streamline operations and avoid the need for manual data transfer or third-party integration that might not be as reliable or efficient.
So, the correct answer is a) Through an API connection.