Which type of ROM can be programmed only once after manufacturing?

Correct option is B

The correct answer is (b) PROM
Explanation: • PROM stands for Programmable Read-Only Memory. • It is manufactured as a blank ROM. • It can be programmed only once by the user using a PROM programmer. • Once written, its contents cannot be changed or erased. • Used in embedded systems requiring permanent instructions.
Information Booster: • PROM uses fuses or antifuses that blow permanently when programmed. • Cheaper than EEPROM and EPROM.
Additional Knowledge: (a) EEPROM (Option a) • Electrically erasable; can be erased and reprogrammed many times.
(c) Mask ROM (Option c) • Programmed during manufacturing, not user-programmable.
(d) EPROM (Option d) • Can be erased using UV light and reprogrammed.