Identify the true$/$correct statement$($s$)$ for the Vanish system.

Vanish uses P$2$P systems $($or distributed hash tables$)$ to store key pieces.

Vanish uses a centralized $3$rd party service to store key pieces.

Users of Vanish should never send keys, which are used for encrypting emails, directly to the receivers. They should store key pieces into P$2$P$/$DHT and only send indices to these key pieces.

If the DHT does not loses key pieces over time, Vanish will be ineffective.