Select all statements accurately comparing IPC on a single system with IPC across two or more systems.
Lost and duplicate messages do not occur with single-system IPC, but may occur with multi-system IPC.
Reads are unnecessary with single-system IPC, because IPC automatically interrupts the application when messages arrive, yet reads are necessary for multi-system IPC.
Port-ids are unnecessary with single-system IPC, but are required for multi-system IPC.
Deallocation of an IPC channel is unnecessary on a single system, but necessary when multiple systems are involved.
Only the designated application may try allocate an IPC channel on a single system, but either application may try to allocate an IPC channel when operating across multiple systems.