Which characteristic is common in identifying a mail bomb?

The identification of mail bombs often relies on several key characteristics, each of which raises suspicion about the contents of the package. When considering the option that encompasses all these characteristics, it becomes clear that these features collectively aid in identifying a potential mail bomb.

Mail bombs are sometimes mailed from foreign countries, which can be a red flag, especially if the sender's address is unusual or unexpected. Therefore, the origin of the mail can be a significant factor in determining its legitimacy or potential threat.

Additionally, mail bombs are often specifically addressed to an individual by name or title. This personalized targeting may suggest that the sender has a specific intention, which can be an indicator of malicious intent.

The bulk and weight of the package also play a crucial role in identification. Packages that are larger or heavier than a standard airmail letter can signal that they may contain dangerous materials or explosive devices, as these components typically require a more substantial casing than what would be found in a regular letter.

Considering all these factors, the choice that includes all of these characteristics offers the most comprehensive criteria for identifying a mail bomb. Therefore, it illustrates the complexity and the multifaceted approach required to assess potential threats in mail screening.