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Which of the following statements $\text{A-E}$ about firewalls in computer networks are true?

  1. Firewalls are only available as hardware devices and only examine traffic entering a network.
  2. Firewalls allow a user to set rules for network traffic.
  3. Firewalls will automatically stop all malicious traffic,
  4. Firewalls backup all data that is transmitted around a network.
  5. Firewalls can be used to block access to certain websites.

Choose the correct answer from the options given below:

  1. $\text{(a)}$, $\text{(c)}$ and $\text{(d)}$ only
  2. $\text{(b)}$ and $\text{(e)}$ Only
  3. $\text{(b)}$, $\text{(d)}$ and $\text{(e)}$ Only
  4. $\text{(a)}$ and $\text{(c)}$ Only

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