In a punched card system, data is processed by a
a. Keypunch machine, sorterand posting machine
b. Accounting machine, posting machine, and billing machine
c. Sorter, posting machine, and billing machine
d. Accounting machine, keypunch machine and sorter
a. Keypunch machine, sorterand posting machine
b. Accounting machine, posting machine, and billing machine
c. Sorter, posting machine, and billing machine
d. Accounting machine, keypunch machine and sorter