How can sound be represented in a digital format?

A sound is represented in a digital format by converting the sound  into a sound wave. A microphone is used to convert the sound into an electrical signal  A computer program then converts the analog signal to a digital signal. This process is known as pulse-code-modulation. The ability to convert an analogue sound into a digital format has revolutionised the music industry. The digital files are far smaller than the old analogue files. Digital files are far easier to distribute in the form of a downloadable file. 

Iwould go with either b or c, not sure which one.

Company has asked employees for suggestions on ways to personalize the retail customer's shopping experience. they want to supplement traditional appeals to the customer. you have come up with several ideas. select the idea or ideas you have decided to submit.c. designate two of the curtained areas in the women's dressing room for nursing mothers  d. tailor merchandise in each store to the preferences of customers in that geographical region