(i)any enterprise carrying on the business [of (i) developing or (ii) operating and maintaining or (iii) developing, operating and maintaining] [ Substituted by Act 14 of 2001, Section 44, for " of (i) developing, (ii) maintaining and operating or (iii) developing, maintaining and operating" (w.e.f. 1.4.2002).] any infrastructure facility which fulfills all the following conditions, namely:-