Question 12
Below is the man page of `grep`.
Which of the following commands will print only the name of all .txt files that do not contain the word "error"? Assume the current directory does not have any subdirectories. Assume the filenames are alphanumeric.
grep -L "error" *.txt
grep -v "error" *.txt
grep -L "error" -- *.txt
find . -name "*.txt" | xargs grep -L "error"