Question: Here's the solution to a HW assignment I had, and I got a 48/50 on it. According to this one, it looks like I was

Here's the solution to a HW assignment I had, and I got a 48/50 on it. According to this one, it looks like I was missing the parts that say (EMP?='Y'), (Vol?='Y'), (Don?='?') What does this all mean? What does it represent? What's the difference between y and ? ?

PERSON SSN Name Address City State Zip Code Telephone Person Type (Emp?, Vol?, Don?) Emp?='Y' Don?='Y" Vol?='Y" EMPLOYEE VOLUNTEER Date Hired {Skill} DONOR Donates ITEM

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