In MS SQL Server, the correct syntax for creating a composite index involves listing the columns within parentheses, separated by commas. Composite indexes are used to create an index on multiple columns of a table. This helps in optimizing query performance that involves these columns.

Here’s the correct syntax for creating a composite index:

CREATE INDEX index_name ON table_name (column1, column2);

CREATE INDEX index_name ON table_name (column1, column2);

Explanation of the Options:

CREATE INDEX index_name ON table_name(column1), table_name(column2);
    This syntax is incorrect because it separates the columns with a comma and mistakenly repeats the table name.

CREATE INDEX index_name ON table_name(column1) and table_name(column2);
    This syntax is incorrect because it uses the word and, which is not valid in this context.

CREATE INDEX index_name ON table_name(column1, column2);
    This syntax is correct. It creates a composite index on column1 and column2 within the table table_name.

All the above-mentioned syntax are correct.
    This option is incorrect because not all the provided syntaxes are valid.

Conclusion

The correct syntax is: CREATE INDEX index_name ON table_name (column1, column2);

CREATE INDEX index_name ON table_name (column1, column2);