Supply costs at Lattea Corporation's chain of gyms are listed below: Client-visit Supply Cost March 11647 28561 April 11443 28395 May 11975 28819 June 11288 28692 July 11707 28622 August 11193 28221 September 11987 28820 October 11678 28578 November 11826 28703 Management believes that supply cost is a mixed cost that depends on the client-visit. Using the high-low method to estimate the variable and fixed components of this cost, those estimates would be closest to: a. $0.75 per client-visit; $19,826 per month b. 50.75 per client-visit; $19,777 per month c. $0.79 per client-visit; $19,321 per month d. $1.33 per client-visit: $12,768 per month e. $0.75 per client-visit; 18,921 per month