Which of the following expressions would you use to test if a char variable named choice is equal to "y" or "Y"? a. choice. tolower = "y" || "Y" b. choice. tolower = "y" c. tolower(choice) = "y" d. tolower(choice) = "y" || "Y"

choice.tolower == "y"

Explanation:

The tolower method is a string method in c# that converts all characters in a string to lowercase characters(if they are not already lowercase letters) except special symbols which remain the same example "#" symbol.

The tolower method does not take any arguments, therefore to use it, we simply chain it to our string variable(dot notation) and use a comparison operator "==" that evaluates to true or false based on whether the values returned on both sides are equal.

the answer to your question would be something called hertz. the unit of measurement called a hertz, which is one cycle per second, is used to measure clock speed. within one cycle, your computer processes, refreshes, or updates itself to the changes that it is going through. in the case of computer clock speed, one hertz equals one tick per second. the clock speed of computers is usually measured in megahertz (mhz) or gigahertz (ghz)