The correct answer is option 'C) Optical Discs'.

Optical Discs are a type of storage media that use a combination of PITs (Binary Value '0') and LANDs (Binary Value '1') to store data. These discs are commonly used for long-term data storage and are known for their large storage capacity.

Below, we will discuss in detail why optical discs use a combination of PITs and LANDs for data storage:

1. Optical Discs:
- Optical discs are a type of storage medium that uses a laser to read and write data. They are made up of a flat, circular disc with a reflective surface.
- The most common types of optical discs are CD (Compact Disc), DVD (Digital Versatile Disc), and Blu-ray Disc.
- Optical discs have a high storage capacity, making them suitable for storing large amounts of data, including audio, video, and computer files.

2. Data Storage on Optical Discs:
- The reflective surface of an optical disc is divided into microscopic pits and lands.
- Pits are small depressions in the disc's surface, while lands are flat areas between the pits.
- The laser in an optical disc drive reads the data by detecting the transitions between the pits and lands.
- The presence of a pit represents a binary value '0', while the absence of a pit represents a binary value '1'.
- When the laser hits a land, it reflects back to the sensor, indicating a binary value '1'.
- However, when the laser hits a pit, it scatters, resulting in little or no reflection, indicating a binary value '0'.

3. Advantages of Using PITs and LANDs:
- The use of PITs and LANDs on optical discs provides several advantages:
- High storage capacity: The microscopic nature of PITs and LANDs allows for a large amount of data to be stored on a single disc.
- Durability: Optical discs are resistant to scratches and dust, ensuring the longevity of the stored data.
- Non-volatile storage: Optical discs retain data even when not powered, making them ideal for long-term storage.
- Read-only or rewritable: Optical discs can be either read-only (such as commercial DVDs) or rewritable (such as DVD-RW discs), providing flexibility for different data storage needs.

In conclusion, optical discs use a combination of PITs and LANDs to store data. These microscopic features represent binary values '0' and '1' respectively, allowing for high-capacity, durable, and non-volatile storage.