Final answer:
The generally external computer fraud is spoofing.
Step-by-step explanation:
An external computer fraud refers to unauthorized activities performed by individuals outside the organization or system. Among the options provided, spoofing is generally considered an external computer fraud. Spoofing is when an attacker disguises themselves as a legitimate user or device to gain unauthorized access to systems or data.
In contrast, input manipulation, program manipulation, and output manipulation are usually categorized as internal computer frauds. These involve unauthorized activities carried out by individuals who have authorized access to the system but misuse their privileges.