Which of the following can be used with the double trailing at sign @@?

The double trailing at sign @@ is a specific operator used in SAS programming that allows for reading data values across multiple lines in a single INPUT statement. This feature is particularly useful in situations where data records span several lines and ensures that SAS continues to read from the same line during iterations of the data step until no additional data are available.

When considering the context of the other listed options, the following points are relevant:

• The single trailing at sign @ is used to hold the input line for subsequent input statements but operates differently than the double trailing at sign. They cannot be used together on the same INPUT statement because they serve distinct purposes, hence they are not compatible.

• The MISSOVER option is designed to prevent SAS from moving to the next line if it encounters missing values and allows it to retain the current line's data. While it can be used with various input methods in SAS, it does not directly relate to the functionality of the double trailing at sign, which is intended for managing the reading of lines.

• Column input refers to the method of reading data by specifying columns directly, using fixed positions within the data records. While column input is a standard method of reading data in SAS, it does not utilize the double trailing at sign, as that functionality