Let R be the region bounded by the function y = 1x + 1, y = 1 and x =4. O A. Integral using Disk/Washer method is 2x[ ]dy and integral using Shell method is at[ ]dx 0 O B. is In1 22 - ( 2 - x ) 2 jax and integral using Shell metho s J zx1 (3 - 4 ) ( 4 - (4 - 1) 2 ) jay 0