Which of the following was/were steps taken by Sher Shah to promote trade and commerce

Q. Which of the following was/were steps taken by Sher Shah to promote trade and commerce?

1. Making travel safe for trader.

2. Building a new highway between Delhi and Warangal.

3. Abolishing internal duties and levying taxes only at the points of import and sale.

4. Building sarais along roadways.

(a) 1, 2 and 3

(b) 2 and 3

(c) 1, 3 and 4

(d) 1, 2, 3 and 4

Ans: (c) 1, 3 and 4