Which of the following statements concerning APPLCOMPAT is TRUE?

Question $13$Select one:

A$.$

Once a subsystem has migrated to Db$212,$ there is no APPLCOMPAT setting that will specify Db$211$ compatibility behavior

B$.$

Once a subsystem has migrated to Db$212,$ there is no APPLCOMPAT setting that will specify Db$210$ compatibility behavior

C$.$

The APPLCOMPAT option specifies the application compatibility behavior for static SQL statements and sets the initial value of the CURRENT APPLICATION COMPATIBILITY special register for dynamic SQL statements in the package

D$.$

If the current function level is $501,$ APPLCOMPAT can be set to V$12$R$1$M$502$ to allow function level $502$ behavior for a specific package