Transform the following sentences as directed: 

Badal is the fastest of the two boys. = Badal is the fastest among the two boys

Not all the members were present.

The original sentence, "All the members were not present," is grammatically ambiguous and often considered unidiomatic in standard English. It attempts to express a partial negation, implying that some members were present, but not every single one of them.

To clearly and idiomatically express a partial negation, the word "not" should typically precede "all" or "every." Therefore, "Not all the members were present" is the most straightforward and grammatically preferred way to convey that only some of the members were absent.

If the intended meaning was a complete negation—that is, absolutely zero members were present—the correct phrasing would be different:

    
• None of the members were present.
    
• No members were present.

Understanding and applying such nuances in negation is important for clear and precise communication, particularly in professional contexts relevant to job seekers.

In English grammar, when choosing between a limited number of options, the interrogative pronoun "which" is typically used instead of "who." While "who" refers to a person, "which" specifically implies selection from a definite, restricted group. In the given sentence, the phrase "of the two officers" clearly indicates a choice from a specific, limited set of two individuals. Therefore, "which" is the appropriate pronoun to ask for a selection from these two options.