Answer:
.
implied though not plainly expressed.
"comments seen as implicit criticism of the policies"
Answer:
The ghost of the King of Denmark tells his son Hamlet to avenge his murder by killing the new king, Hamlet's uncle. Hamlet feigns madness, contemplates life and death, and seeks revenge. His uncle, fearing for his life, also devises plots to kill Hamlet. The play ends with a duel, during which the King, Queen, Hamlet's opponent and Hamlet himself are all killed.
It's 3. All the other answers are opinons and not provable by fact.
You did not include options in your question, but based on the meaning of the word cryptic, your answer will be 'A HIDDEN MEANING'.
When you say that something is cryptic, it means that, that thing has a meaning that is mysterious or obscure.
From the way the word was used in the given sentence, it means that the message the teacher was passing across about the test is hidden, it was not understood by any of the students.