The correct answer is B. round().
The round() function rounds a number to a specified number of decimal places. The syntax for the round() function is:
round(number, decimalPlaces)
where number is the number to be rounded, and decimalPlaces is the number of decimal places to which the number should be rounded.
For example, the following code rounds the number 12.3456 to 2 decimal places:
round(12.3456, 2)
The result of this code is 12.35.
The sqrt() function returns the square root of a number. The syntax for the sqrt() function is:
sqrt(number)
where number is the number whose square root is to be found.
For example, the following code returns the square root of 9:
sqrt(9)
The result of this code is 3.
The abs() function returns the absolute value of a number. The syntax for the abs() function is:
abs(number)
where number is the number whose absolute value is to be found.
For example, the following code returns the absolute value of -5:
abs(-5)
The result of this code is 5.
The len() function returns the length of a string. The syntax for the len() function is:
len(string)
where string is the string whose length is to be found.
For example, the following code returns the length of the string “Hello”:
len("Hello")
The result of this code is 5.