フリー問題

問題文

Why can a map from the concurrent package be read while another writer updates it?

選択肢

1. The internal design partitions updates so that readers observe stable state, and the shell around one plain map consequently forces buffered access here.
2. The internal design partitions updates so that readers observe duplicated state, and the shell around one plain map consequently forces buffered access here.
3. The internal design partitions updates so that readers observe stable state, and the shell around one plain map consequently forces serial access here.
4. The internal design partitions updates so that readers observe duplicated state, and the shell around one plain map consequently forces serial access here.