Programmable Logic Devices (PLDs)
Programmable Logic Devices (PLDs) are digital electronic devices that can be programmed to perform a specific logic function. They are widely used in the field of digital design and provide a flexible and cost-effective solution for implementing complex logic functions.

PLDs with programmable AND and fixed OR arrays
PLDs typically consist of an array of programmable AND gates followed by an array of fixed OR gates. The programmable AND gates allow for the implementation of user-defined logic functions, while the fixed OR gates combine the outputs of the AND gates to generate the final output.

Types of PLDs
There are several types of PLDs available in the market, each offering different levels of programmability and flexibility. Some common types include Programmable Array Logic (PAL), Programmable Logic Array (PLA), and Complex Programmable Logic Device (CPLD).

Programmable Array Logic (PAL)
PAL is a type of PLD that features a programmable AND array and a fixed OR array. The AND array consists of a set of programmable AND gates that can be connected to any input or complemented input. The OR array consists of a fixed set of OR gates that combine the outputs of the AND gates.

PLA vs. PAL
While both PLA and PAL feature programmable AND gates and fixed OR gates, the primary difference lies in the level of programmability. In a PLA, both the AND and OR arrays are programmable, allowing for greater flexibility in implementing logic functions. In contrast, a PAL only has a programmable AND array, with the OR array being fixed.

Answer: PAL
Given the description provided in the question, the correct answer is option A - PAL. PLDs with programmable AND and fixed OR arrays are commonly referred to as PALs. This distinction is important in the field of digital design as it helps in selecting the appropriate PLD for a given application based on the required level of programmability and flexibility.