Which of the following viruses infects multiple targets?

A macro virus only infects documents or files that support macro languages such as those used in Microsoft Office, targeting a single file type.

A multipartite virus attacks more than one type of target at the same time, typically infecting both the master boot record (or boot sector) and executable program files. This dual-vector infection makes it especially difficult to eradicate because all infected targets must be cleaned. Its multi-target nature is the defining characteristic that sets it apart from all other virus categories.

A polymorphic virus mutates its code signature each time it replicates to evade antivirus detection, but it still targets only one type of file or system area.

A stealth virus conceals its presence and modifications from antivirus tools but does not inherently infect multiple distinct types of system targets.