If $|\mathrm{a}|$ denotes the absolute value of an integer, then which of the following are correct? 1. $|\mathrm{ab}|=|\mathrm{a}||\mathrm{b}|$ 2. $|a+b| \leq|a|+|b|$ 3. $|a-b| \geq||a|-|b||$ Select the correct answer using the code given below.

• A

  $1$ and $2$ only
• B

  $2$ and $3$ only
• C

  $1$ and $3$ only
• Correct answer
  D

  $1,2$ and $3$

Hence, the correct answer is option: 'D'.