Final Answer:
The following acronyms are pronounced letter-by-letter
Option 1: FBI
Option 4: NATO
Therefore, correct options are Option 1: FBI, Option 4: NATO.
Step-by-step explanation:
Acronyms can be pronounced in various ways, either as a word or by stating each letter individually. In the given options, FBI (Federal Bureau of Investigation) and NATO (North Atlantic Treaty Organization) are acronyms pronounced letter-by-letter. When referring to these organizations, it is customary to articulate each letter in the acronym, such as "eff bee eye" for FBI and "en ay tee oh" for NATO.
Conversely, NASA (National Aeronautics and Space Administration) and TV (Television) are acronyms pronounced as words. "Nasa" is used for the space agency, and "tee vee" is the pronunciation for TV.
Therefore, correct options are Option 1: FBI, Option 4: NATO.