What Does Rigorous Mean
What does the term strict mean?
When you come across a particular term, it should be set aside for reading. The most common way is to enter a price. So it would be good to make a claim. However, since you have access to the internet and it seems you don't have a dictionary at home, you decide to ask. Sorry, but using a dictionary to learn the meaning of words, how to spell them, etc. This is important for education. Do you know which answer is correct? Use a dictionary.
Tough means hard and fast.