With reference to the policy of Ring-Fence, consider the following statements:

1. The policy was mostly aimed at the defense of the company's frontier.

2. The policy was devised to encounter the powerful combination of Maratha, Mysore, and Hyderabad.

3. Unlike subsidiary alliance states brought under the ring-fence system were assured of military assistance against external aggression on the expenses borne by the British Government. 

Which of the above-given statements is/are correct?