When operating in NPS compatibility mode, which of the following are limitations for using a routine written in NZPLSQL? (Choose two.)
A. The routine cannot contain comments.
B. The routine must return either an integer or a null.
C. The routine must be cross-compatible with Oracle PL/SQL syntax rules.
D. The routine cannot contain argument lists or variable arguments (varargs).
E. The routine must be generated with IBM Database Conversion Workbench (DCW).