E$2\mathrm{.}1$ Create an entity based on the following scenarios.

E$2\mathrm{.}1$a Create an entity based on the following requirement:

For each doctor, we will keep track of a DoctorID $($unique$),$ DoctorName, and DoctorYearOPMDGraduation $($year of graduating from medical school$).$

E$2\mathrm{.}1$b Create an entity based on the following requirement:

For each doctor, we will keep track of a DoctorID $($unique$),$ DoctorName $($composed of first and last name$),$ and DoctorYearOPMDGraduation $($year of graduating from medical school$).$

E$2\mathrm{.}1$c Create an entity based on the following requirement:

For each doctor, we will keep track of a DoctorID $($unique$),$ DoctorLicense $($unique$,$ composed of LicenseNo and State$),$ DoctorName, and DoctorYearOfMDGraduation $($year of graduating from medical school$).$

E$2\mathrm{.}1$d Create an entity based on the following requirement:

For each doctor, we will keep track of a DoctorID $($unique$),$ DoctorName, DoctorYearOfMDGraduation $($year of graduating from medical school$),$ and one or more specializations.

E$2\mathrm{.}1$e Create an entity based on the following requirement:

For each doctor, we will keep track of a DoctorID $($unique$),$ DoctorName, DoctorYearOfMDGraduation $($year of graduating from medical school$),$ and DoctorYearsPracticing $($how many years the doctor has been practicing medicine$).$

E$2\mathrm{.}1$f Create an entity based on the following requirement:

For each doctor, we will keep track of a DoctorID $($unique$),$ DoctorName, DoctorYearOfMDGraduation $($year of graduating from medical school$),$ and DoctorYearOPPDGraduation $($year of acquiring a PhD degree; not every doctor has a PhD degree$).$