GMAT Data Sufficiency Question 53: Algebraic equations in two variables

 
Try the following GMAT data sufficiency question on algebra involving equations and inequalities with two variables.

Question 53:

Is $ab=0$ ?

1. (1) $b < |b|$
2. (2) $ab = 2a$

1. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
2. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
3. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
4. EACH statement ALONE is sufficient.
5. Statements (1) and (2) TOGETHER are NOT sufficient.