Match List-I (drill bits) with List -II (Applications) and select the correct answer using the codes given below the Lists:

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List-I A. Core drill B. Reamer C. Counter-bore drill D. Tap drill Codes: List-II 1. To enlarge a hole to a certain depth so as to accommodate the bolt head of a screw. 2. To drill and enlarge an already existing hole in a casting. 3. To drill a hole making internal threads 4. To improve the surface finish and dimensional accuracy of the already drilled hole. D A B C 4 (a) (b) (c) 72274 83342 11223 1 1 4 31