Challenge 2: A Product Tuple — Possible Solution
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fn main() {
    let product: (i32, f64, char) = (108, 24.99, 'E');

    println!("ID: {}", product.0);
    println!("Price: {}", product.1);
    println!("Category: {}", product.2);
}

WHY THIS WORKS AS AN ANSWER
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The tuple type annotation (i32, f64, char) matches exactly the three
required fields in order — id as i32, price as f64, category initial
as char — the same three-element mixed-type tuple pattern this
chapter's own point example demonstrated.

Each field is accessed using Rust's tuple-indexing syntax: .0 for the
first element (id), .1 for the second (price), .2 for the third
(category) — dot-followed-by-a-number, not square-bracket indexing
(which is reserved for arrays and slices, a different compound type
covered in the same chapter). Printing each with its own println! call
demonstrates accessing all three fields individually, exactly as the
challenge asked.