Solve the Problem $\mathrm { dy } \mathrm {} \mathrm { dz } \mathrm { dx }$

Solve the problem.
-Write an iterated triple integral in the order $\mathrm { dy } \mathrm {} \mathrm { dz } \mathrm { dx }$ for the volume of the region in the first octant enclosed by the cylinder $x ^ { 2 } + z ^ { 2 } = 49$ and the plane $y = 4$ .

A) $\int _ { 0 } ^ { 7 } \int _ { 0 } ^ { \sqrt { 49 - x ^ { 2 } } } \int _ { 0 } ^ { 4 } d y d z d x$
B) $\int _ { 0 } ^ { 7 } \int _ { 0 } ^ { \sqrt { 49 - z ^ { 2 } } } \int _ { 0 } ^ { 4 } d y d z d x$
C) $\int _ { 0 } ^ { 7 } \int _ { 0 } ^ { \sqrt { 49 - z ^ { 2 } } } \int _ { 0 } ^ { 4 - z } d y d z d x$
D) $\int _ { 0 } ^ { 7 } \int _ { 0 } ^ { \sqrt { 49 - x ^ { 2 } } } \int _ { 0 } ^ { z } d y d z d x$