True or False: Once a field is created in Marketo, it cannot be deleted.

The assertion that once a field is created in Marketo, it cannot be deleted is indeed true. This design decision is rooted in the need to maintain data integrity and avoid potential disruptions in the processes that rely on that data. When fields are created, they may be linked to various elements such as forms, campaigns, and reports. Deleting a field could lead to inconsistencies or issues in these associated elements.

Marketo allows for fields to be hidden or marked as inactive, which prevents them from being used in forms or other functionalities while still preserving historical data and relationships. However, the system does not allow for permanent deletion to ensure that data continuity and system integrity are maintained. Therefore, once a field is established, it cannot be fully removed from the Marketo instance.