$$ Each question is marked as $[$O$]$ or $[$S$]$ denoting Objective or Subjective respectively.

$[$O$]$ questions have a well$-$defined correct answer and will be graded accordingly.

An explanation of the answer is required. Keep your answer to the point.

$[$S$]$ questions can have several $$correct$$ answers and will be graded accordingly.

Formulate your response with the following mindset: Suppose you are the security expert in your organization

and your boss poses this question to you for your expert opinion. How would you respond?

$$ Answers are anticipated to require a short paragraph. Say $5-6$ lines at most. However, no minimum or maximum

size is specified. Use your judgement. Stay on topic and address the question.

$$ Your solution should conform to the examination submission template.

Answer all $10$ questions: $5$ are $[$O$]$ and $5$ are $[$S$].10$ points each for a maximum of $100.$

$1.[$O$]$ What is the value of $\backslash |84\backslash |?$ Explain how you arrived at the answer.

$2.[$O$]$ How many elements are in the multiplicative group Z$3869*$

$?$ Explain how you arrived at the answer.

$[$Hint: $3869$ is a product of $2$ primes, $53$ and $73.$ See module $9\mathrm{.}2$ slide $16.]$

$3.[$O$]$ Identify an integer in the range $1$ to $3868$ which is not an element of Z$3869*.$ Justify your answer.