The ________ is responsible for allocating ranges of EM frequencies for different public uses

Which of the following is an invalid definition?

a. string sa = "computers"; b. string sb{"computers"}; c. string sc{"c"3}; d. string sd{9, 'c'};

Case-Based Critical Thinking Questions ? Case 1: BrainPower Tutoring ? The owner of BrainPower Tutoring needs an application that clients can use to request an appointment. The application should allow users to enter their name, subject, preferred appointment time, and phone number, and submit their request. It should also allow them to print their appointment request, clear the screen, and exit the application. The tutoring center has some clients with visual impairments, so the application should be easy for them to use. Which of the following statements is true about the user interface?

A. The interface should be designed using black text on a white background. B. The interface should include a text-to-speech reader. C. The interface should use plenty of colors to appeal to young clients. D. The interface should use a different font for each field to keep users from being confused.