To reference existing ASM files， you need to use a fully qualified ASM filename. Your development database has a disk group named DG2A， the database name is DEV19， and the ASM file that you want to reference is a datafile for the USERS02 tablespace.  Which of the following is a valid ASM filename for this ASM file？（）

• A、 dev19/+DG2A/datafile/users02.701.2
• B、 +DG2A/dev19/datafile/users02.701.2
• C、 +DG2A/dev19/users02/datafile.701.2
• D、 +DG2A·701.2
• E、 +DG2A/datafile/dev19.users.02.701.2