Match the following.

List-I	List-II
a. Public choice school	1. Pleads for debureaucratisation and democratisation of administration
b. Critical approach	2. A variety of different organisational arrangements can be used to provide different public goods and services
c. Ecological approach	3. To hasten the emergence of a universally valid body of knowledge concerning administrative behaviour
d. Comparative administration	4. To explore the dynamics of the interaction between public administration and its environment