a manufacturing company has employees that earn skill certifications. each employee can earn multiple skill certifications and each certification can be earned by more than one employee. some, but not all, employees have developed a personal goal document wherein they describe how they want to progress. the company keeps copies of each goal document. please select as many of the following as are correct principles to follow when producing the full erd (with attributes and keys). (minimum cardinalities have been included where appropriate, and primary keys have been