Which one of the following statements about the Harappan script is NOT

Which one of the following statements about the Harappan script is NOT correct ?

It has about four hundred signs
It was written from right to left
It has been found on bone rods and jewellery
It refers to the people of Meluhha
This question was previously asked in
UPSC CAPF – 2020
The statement “It refers to the people of Meluhha” about the Harappan script is NOT correct. Meluhha is the name used in Mesopotamian texts, written in Cuneiform script, believed to refer to the Indus Valley Civilization. The Harappan script itself is undeciphered, so we do not know what names or people it refers to internally. The other statements are generally considered correct based on current understanding of the Harappan script.
The Harappan script is undeciphered, meaning its language and content are unknown. Mesopotamian texts mention trade with a land called Meluhha, widely identified with the Indus Valley region.
Estimates for the number of signs in the Harappan script vary but are generally around 400-600, suggesting it was likely logographic-cum-syllabic. Evidence from overlapping signs suggests it was written from right to left, though boustrophedon (alternating direction) is also possible. While most inscriptions are found on seals, they also appear on pottery, copper tablets, tools, ivory rods, and potentially on other materials.