What must you take into consideration when you use the new Open SQL syntax (available as of SAP NetWeaver 7.4 SP05)? Note: There are 2 correct answers to this question.

What must you take into consideration when you use the new Open SQL syntax (available as of SAP NetWeaver 7.4 SP05)? Note: There are 2 correct answers to this question.
A . All classical open SQL statements in your program will become invalid.
B. All ABAP variables must be escaped with a preceding @ sign.
C. All fields in the GROUP BY clause must be separated by commas.
D. All arithmetic expressions can be used for all types of variables.

Answer: B,C