Assertion. The join in which columns are compared for equality, is called an Equi-join.

Reason. The join condition can only compare columns with equal sign.

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.

A is true but R is false.

Explanation
In an equi-join, the values in the columns being joined are compared for equality. The join condition can use various types of comparisons, including equality (=) and other logical operators such as "<>", "<", ">", "<=", ">=".