Consider the given statements with respect to unburnt or sun dried bricks.
a. Unburnt or sun dried bricks can be used only in the construction of temporary and cheap structures.
b. Unburnt or sun dried bricks should NOT be used at the places exposed to heavy rains.
1. Both the statement are true.
2. Both the statements are false.
3. Statement a is false and statement b is true
4. Statement a is true and statement b is false.