Find the SQL Bug

What is wrong with this SQL statement?

Review the PostgreSQL query below and provide a corrected version. It is intended to report accounts whose settled, positive card transactions total at least 100.

SELECT a.account_id, a.account_name,
       SUM(t.amount) AS settled_total,
       COUNT(t.transaction_id) AS transaction_count
FROM accounts a
LEFT JOIN card_transactions t
  ON a.account_id = t.account_id
WHERE t.status = 'settled'
  AND t.amount > 0
GROUP BY a.account_id
HAVING settled_total >= 100
ORDER BY settled_total DESC;

Output

1. One row per qualifying account.
2. Columns: account_id, account_name, settled_total, and transaction_count.
3. Include only accounts with settled positive transactions totaling at least 100.
4. Order by total descending, then account_id ascending.