Volunteers With All Three Certifications

Problem

You are given a DataFrame `certs` with columns `volunteer_id` and `cert`, listing each certification a disaster-relief volunteer holds (rows may repeat).

To lead a field team a volunteer must hold all three of **FirstAid**, **Logistics**, and **Radio**. Return the `volunteer_id` of every volunteer who holds all three (they may hold others too), ordered by `volunteer_id` ascending.

Input data

Example rows — the live problem includes the full dataset.

Expected output

Your answer should return 2 rows with the columns volunteer_id.

Starter code (Pandas (Python))

import pandas as pd

def volunteers_with_all_three_certs(certs) -> pd.DataFrame:
    # Your code here
    return certs

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