4(a)  List three criteria that are used in classifying files.

4(b) State two advantages and two disadvantages of computer files.

4b(ii) State three methods of file security.

5(a) Define Programming Language.

5b(ii) Write this mathematical expression in BASIC notation: x(w + y)2

5b(iii) Write this mathematical expression in BASIC notation: ab ÷ cd

5b(iii) Write this mathematical expression in BASIC notation: p = 2 (l+b).

5(c) Write a simple BASIC program to calculate the area (A) of a rectangle with length (1) and breadth (b).

5(d) List two levels of programming language.