Vou are planning a routine that will query a database for a sales representative's commission rate, multiply this rate by each item in a liat of daily sales totals to determine the daily commissions, then sum them to determine the total commisaion for the month. You consider writing a loop to iterate over the list items, whose body would include statements that: $(1)$ retrieve the commiasion rate from the database, $(2)$ multiply the rate by a daily sales value, and $(3)$ add that value to an accumulator. Additional body statements would alter the loop control variable, This loop would

a$.$ never terminate

b$.$ be inefficient

c$.$ nat reaum the desired results

d be unath pured