Because the inca did not have a writing system, they still needed information and documentation about what was occurring within the provinces. the inca used a system of knots and threads

Quipu

Explanation:

In the Incas language, Quechua, Quipu meant knots.

The Incas did not have written language so, they developed a unique form record keeping and documentation. This form of record-keeping is known as Quipu.

Quipu was invented by Andean American Culture. In this, different colors of strings are used to refer to different things. The codes and numbers were encoded with a string. The string used in Quipu was of cotton fiber.

Incas used this form language to maintain the records, collecting data, dates information or calendars, etc.

So, the correct answer is Quipu.

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