Final answer:
The UPPER() function converts all letters in a given text to uppercase, so the correct format is 3) Uppercase.
Step-by-step explanation:
The UPPER() function is used to convert all letters in a given text to uppercase. When you apply the UPPER() function to text, all the alphabetic characters will be transformed to their uppercase counterparts. For example, if you use UPPER() on 'Hello World', it will return 'HELLO WORLD'.
This function is commonly used in spreadsheets and programming languages to ensure uniformity of text data, especially when case sensitivity might affect sorting or searches. So, in response to your question, the correct option is 3) Uppercase.