Hello, please show and explain what the answer is to part b and why. Thank you

$6% Part (b) Enter an expression for E. dA on the front face of the rectangular box. For the magnitude of dA use d4. Grade Summary E.dA = (1/80 ) idA Deductions 40% Potential 96% 7 GO 9 HOME Submissions Attempts remaining: 8 a b TA 4 5 6 (2% per attempt) C dA 1 2 3 detailed view END 2% P 0 2% X y Z VO BACKSPACE CLEAR Submit Hint Feedback I give up!(50%) Problem 1: A Gaussian surface in the shape of a rectangular box is centered at the origin= and its edges are parallel to the coordinate axes. Edges parallel to the 3: axis have length a; edges parallel to the 3: axis have length in; edges parallel to the z axis have length is. Auniforrn and constant electric field E = Ex? Erj Elli: fills the region of space which contains the rectangular box. *