Length() is a numeric function.

Functions MID() and SUBSTR() do the same thing.

INSTR() and SUBSTR() work identically.

Assertion. Single row functions when applied on a column in a table, yield multiple values equal to number of rows in the table.

Reason. Single row functions work with individual rows and yield values accordingly.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.