The correct option is C Obligatory and Discretionary
The functions of Municipal Corporation are of two types. (1) Obligatory and Discretionary. The obligatory function includes this function which must be performed by the Corporation the discretionary functions are those which are not compulsory but may be taken up depending upon its final resources. Obligatory functions include the supply of water and maintenance of waterworks, the supply of electricity, maintenance of roads. etc. Discretionary functions include construction of Public Houses, registration of marriages, construction of public parks and gardens.etc.