I want to know the answer to the following question:
When did Montini finally become a cardinal?
All the background I'm provided with is that "Although some cardinals seem to have viewed him as papabile, a likely candidate to become pope, and may have received some votes in the 1958 conclave, Montini was not yet a cardinal, which made him an unlikely choice.[c]". Is that enough to answer the question?
Answer: no