Question: Which choice is not of invoking strict mode in JavaScript?

1. it eliminates some JavaScript silent errors by changing them to throw errors.
2. it prohibits some syntax likely to be defined in future versions of ECMAScript.
3. it forces the writing of valid HTML and CSS.
4. it fixes mistakes that make it difficult for JavaScript engines to perform optimizations.

Answer: The correct answer of the above question is Option C:it forces the writing of valid HTML and CSS.