What should the expression include for validation when allowing for an empty field? a null value a true value a false value an error value

Dr. wisteria is a prominent chiropractor in the chicago area. she wants to provide a forum for her patients to discuss their health concerns and to seek and offer advice to other patients. which telecommunications tool is most appropriate for dr. wisteria's needs?

Aconstruction company is creating a powerpoint presentation describing how they calculate costs during each construction step. they plan to email this presentation to clients. the individual clients will be watching the presentation slide show on their own personal computers. what is the most important formatting step the company should take to make the text readable and pleasing to the eye?

Before you record your own voice, you should a. record other people's voices b. warm up and practice difficult names c. listen to your favorite songs d. read a transcript of a good radio news segment