Based on the above scenario, the strategy used by the firm is called Defense in depth.
Defense in depth is known to be a kind of strategy that uses a lot of security measures in the work of protecting firm's assets.
Note that they act so that if if one line of defense is known to be compromised, additional layers can be or be seen as a form of backup.
Therefore, Based on the above scenario, the strategy used by the firm is called Defense in depth.
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