Under which condition can weapons be fired when under 'Weapons Hold'?

The condition of 'Weapons Hold' signifies a specific engagement rule where the use of weapons is highly restricted to avoid unnecessary escalation of force or civilian casualties. Under these rules, weapons can primarily be discharged only in self-defense or when a formal order has been issued by a designated authority. This ensures that soldiers exercise restraint and judgment, engaging enemy forces only when their own safety is at immediate risk or when they receive explicit command to do so, thereby adhering to the principles of proportionality and necessity in military engagement.

In contrast, the other conditions outlined in the other choices imply a broader authority to engage that contradicts the intent of 'Weapons Hold'—to limit engagement to very specific circumstances. For instance, firing at any target in the vicinity, recognizing only hostile targets without proper orders, or engaging unidentified targets would all represent an escalation that the 'Weapons Hold' command seeks to prevent.