What is the correct sequence of the following events of construction of a shaft in rock ?_x005F_x000D_1. drilling and blasting_x005F_x000D_2. timbering_x005F_x000D_3. pumping_x005F_x000D_4. mucking_x005F_x000D_Select the correct answer using the codes given below Codes?

• A. 1,2,3,4
• B. 1,4,2,3
• C. 2,1,4,3
• D. 2,4,1,3