Which is the following Crow's Foot ERD is correct based on the given business rule: Each member of a security unit of a firm has their right thumbprint pattern on file in the sys bio-metric security scanners on secure doors. Thumbprint information is considered sensiti they are stored in a separate table from employee's other data to aid security. Thumbprint information is purged when an employee leaves so every thumbprint on file is related to ex employee. However, not every employee in the employee table is a security employee so so employees have their thumbprint on file and some do not