D & E are always right.
A is only right for positional parameters, not for named ones.
B is only right for positional parameters and those parameters distinguish in their types
it is D and E
https://docs.oracle.com/en/database/oracle/oracle-database/18/lnpls/plsql-subprograms.html?source=%3Aow%3Alp%3Acpo%3A%3A&source=%3Aow%3Alp%3Acpo%3A%3A&source=%3Aow%3Alp%3Acpo%3A%3A&source=%3Aow%3Alp%3Acpo%3A%3A#GUID-A5DA8CF5-1BCC-4ABE-9B68-DB593FF1D2CC
Subprogram invocations must change only if the formal parameter list acquires new required parameters.
no AE is correct , just read this: https://docs.oracle.com/en/database/oracle/oracle-database/18/lnpls/plsql-subprograms.html?source=%3Aow%3Alp%3Acpo%3A%3A&source=%3Aow%3Alp%3Acpo%3A%3A#GUID-A5DA8CF5-1BCC-4ABE-9B68-DB593FF1D2CC
From your link:
Named
Specify the actual parameters in any order, using this syntax:
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