4.Within a performance audit engagement state whether the following measures are ofeconomy, efficiency or effectiveness?

a)Improvement by 7% in the number of students achieving satisfactory academic grades in a university course.

b)Number of teachers for each 1000 students in a university course.

c)Amount of expenditure on each university student.

d)For university teachers, the ratio of time spent on active teaching instruction to the time spent on administration of the unit of study.