You are working on a product where a **user** can have multiple **accounts**, and each account can receive **notifications**. ### Tables Assume the following schemas: **users** - `user_id` BIGINT PRIMARY KEY - `created_at` TIMESTAMP **accounts** - `account_id` BIGINT PRIMARY KEY - `user_id` BIGINT NOT NULL REFERENCES `users(user_id)` - `created_at` TIMESTAMP **notifications** - `notification_id` BIGINT PRIMARY KEY - `account_id` BIGINT NOT NULL REFERENCES `accounts(account_id)` - `created_at` TIMESTAMP - `is_read` BOOLEAN -- `FALSE` means unread ### Tasks 1) **Account-count distribution**: Return the number of users who have: - exactly **2** accounts - exactly **3** accounts - **4 or more** accounts **Required output columns**: `account_bucket`, `num_users`. 2) **Unread-notification rate among multi-account users**: Among users with **2+ accounts**, compute the **percentage of users** who have **at least one unread notification** across any of their accounts. **Required output columns**: `pct_users_with_unread` (as a percent or decimal; specify which you choose).