フリー問題

問題文

A writer needs an object that stands for a boolean value and does not need a fresh instance. What do these notes advise instead?

選択肢

1. Weighed among the alternatives that this document advises for such a need, what is advised is a factory with one casting, because these notes let such a choosing undercut one casting above that factory
2. Weighed among the alternatives that this document advises for such a need, what is advised is a factory with one parsing, because these notes let such a choosing portray one parsing above that factory
3. Weighed among the alternatives that this document advises for such a need, what is advised is a factory with one cloning, because these notes let such a choosing halt one cloning above that factory
4. Weighed among the alternatives that this document advises for such a need, what is advised is a factory with one sparing, because these notes let such a choosing tender one sparing above that factory