Which of the following is required for not echoing the code?

echo=TRUE
print=TRUE
echo=FALSE
all of the mentioned

The correct answer is C. echo=FALSE.

The echo parameter controls whether or not the code is echoed to the console. When echo=TRUE, the code is echoed to the console. When echo=FALSE, the code is not echoed to the console.

The print parameter controls whether or not the output of the code is printed to the console. When print=TRUE, the output of the code is printed to the console. When print=FALSE, the output of the code is not printed to the console.

Therefore, if you want to not echo the code, you need to set echo=FALSE.