Using the drop$-$down box next to each cost description below, select the number to the graph that best depicts the cost behavior pattern.

a$.$ A cellular telephone bill when a flat fee is charged for the first $500$ minutes of use Answer $1$

per month and additional use costs $$0\mathrm{.}25$ per minute

b$.$ Total selling and administrative costs Answer $2$

c$.$ Total labor costs when employees are paid per unit produced Answer $3$

d$.$ Total overtime premium paid production employees Answer $4$

e$.$ Average total cost per unit Answer $5$

f$.$ Salaries of supervisors when each one can supervise a maximum of $10$ employees Answer $6$

g$.$ Total idle time costs when employee are paid for a minimum $40-$hour week Answer $7$

h$.$ Materials costs per unit Answer $8$

i$.$ Total sales commissions. Answer $9$

j$.$ Electric power consumption in a restaurant Answer $10$

k$.$ Total costs when high volumes of production require the use of overtime Answer $11$

and obsolete equipment

l$.$ A good linear approximation of actual costs Answer $12$

m$.$ A linear cost estimation valid only within the relevant range Answer $13$