Consider the following statements regarding craft production and economic specialization in the Indus Valley Civilization:

1. Harappan artisans specialized in bead-making, shell cutting, and metallurgy, which were often concentrated in specific production zones within cities.

2. The standardized size and shape of terracotta figurines and seals indicate mass production techniques and quality control.

3. Large-scale craft production in sites like Chanhudaro suggests that craft guilds and state-sponsored workshops were central to Harappan economic life.

How many of the above statements are correct?