I want to know the answer to the following question:
Rebirth into the formless realms can only be attained by who?
All the background I'm provided with is that "Rebirths in the Ārūpyadhātu (formless realms) can be attained by only those who can meditate on the arūpajhānas, the highest object of meditation.". Is that enough to answer the question?
Answer: yes