Which of the following features are part of the new syntax for Open SQL?

The correct choice highlights a feature of the new syntax for Open SQL in ABAP, which indeed introduced a comma-separated column list. This makes the query structure more aligned with standard SQL practices, allowing for greater readability and consistency when writing database queries. With the use of commas to separate the fields, developers can easily include, omit, or rearrange columns without being hindered by overly strict formatting rules that were present in previous syntax versions.

In contrast, the other choices reflect elements of ABAP but not features directly related to the new syntax for Open SQL. ABAP variables need to be properly formatted to be utilized in SQL statements, and the notation for escaping them can vary. However, the comma-separated column list stands out as a clear characteristic of the updated syntax, enhancing the ease of use for developers and enabling them to better manage their SQL queries.