The codes given below the lists: (symbols have their usual meaning).

Question

 List-1 gives the different items related to a boundary layer while List-II gives the mathematical expression. Match List-I with List-II and select the correct answer using the codes given below the lists: (symbols have their usual meaning).

List-I                         

1. Boundary layer thickness
2. Displacement thickness
3. Momentum thickness
4. Energy thickness

List-II

Codes:

            A         B         C         D

(a)        1          2          3          4

(b)        2          1          4          3

(c)        2          1          3          4

(d)       1          2          4          3