The alt attribute of the element is very important for user agents that do not display images, such as Lynx and other Web browsers for users of Braille and speech devices.

In relational databases, there is a concept known as ________ that ensures that data cannot be entered into a related table unless it first exists in a primary table

Fill in the blank(s) with correct word

Let x be an int on a machine with four-byte ints. What effect does

x<<=1; x>>=1; have? a) There is no effect. b) The leftmost bit of x is set to zero. c) The rightmost bit of x is set to zero. d) Both b) and c).