Concept:Knowing a word means understanding its correct usage in context—not just spelling or writing it.
Explanation:To truly know a word, you must know how to use it in a grammatically correct way.
You also need to know where (in which context) it fits appropriately.
You must know when (at what situation or time) it is suitable to use.
Spelling or writing alone is not enough for real word knowledge.
Thus, knowing a word involves using it correctly in the right place and time.
Answer:Option A: how, where and when it is used.