What refers to testing that observes how real people interact with the software to test if it’s easy and intuitive to use 15 points

interface testing
availability testing
usability testing
reliability testing

Why should characters such as / \ " ' * ; - ? [ ] ( ) ~ ! $ { } < > # @ & | space, tab, and newline be avoided in file names?

Write a function named printfloatrepresentation(float number) that will print the floating point representation of a number using the format given below. (sign bit) exponent in binary (assumed bit).significandfor example if the number passed an argument is 71 yourprogram should print (0) 10000101 (1).00011100000000000000000similarl y if the number passed to the function as argument is -71 the program should print (1) 10000101 (1).00011100000000000000000

Which of the following "invisible" marks represents an inserted tab?