Undercover operations are not a common way for schools and police to work together. Hence, the correct option is Undercover operations.
An undercover operation is a military operation designed to hide the identity of the party initiating the operation (or to provide plausible deniability by the party initiating the operation). Undercover operations should not be confused with clandestine activities, which are carried out in secret and are intended to remain so.
Undercover operations seek to accomplish their mission objectives in secret, without anybody knowing who funded or carried out the action, or, in certain situations, without anyone knowing that the operation occurred at all.
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