Ten opisodes of an iliness in a population of 20 With regards to the above table, calculate the: A. Point prevalence of the illness for January 31, 1991 (2) B. Period prevalence of the illness for the period April 1tt,1991 to September 30, 1991(2) C. Incidence of illness for the period February 1, 1991 - September 30, 1991 (2).