Consider the following statements:

1. The world's largest active volcano, Hawaii's Mauna Loa, is erupting for the first time in almost 40 years.

2. The volcano's alert level has been upgraded from an "advisory" to a "warning", the highest classification.

3. Mauna Loa last erupted in March and April of 1884, sending lava flows within 8 kilometres of the city of Hilo.

Which of the above statements is/are correct?