Choose the correct statements regarding the 'Subsidiary-Alliance' system: (A) The British would be responsible for protecting their ally from external and internal threats. (B) In the territory of the ally, a British armed contingent would be stationed. (C) The British would provide the resources for maintaining this contingent. (D) The ally could enter into agreements with other rulers or engage in warfare only with the permission of the British. Choose the correct answer from the options given below: