Final answer:
Emails can be versatile in tone, thus option 3 ('Email is a formal type of business communication') is NOT inherently a benefit as emails can also be casual.
The correct option is Option 3.
Step-by-step explanation:
The question is asking which option is NOT a benefit of email communication. In professional settings, emails do offer several advantages, such as not being constrained by time or work schedules, being a quick and efficient means of communication, and providing an electronic paper trail.
However, it is a misconception to consider email as inherently formal. While emails can be formatted formally and used in formal business communications, they are versatile and can also be casual, depending on the context and the relationship between the sender and recipient.
The correct option is Option 3.