Which characteristic best describes PROM (programmable read-only memory)?

The correct choice accurately defines PROM (programmable read-only memory) as chips that are manufactured blank and can be programmed only once. PROM is a type of non-volatile memory that retains its data even when power is turned off. Once a PROM chip is programmed, the data becomes permanent, and the information is not erasable or alterable. This characteristic distinguishes PROM from other memory types such as EEPROM (Electrically Erasable Programmable Read-Only Memory) which can be rewritten multiple times, and Flash memory that allows multiple read/write cycles. Understanding the fundamental properties of PROM is important for applications where permanent storage of data is required without the need for frequent updates.