Step 1: Chain Specification Analysis.
According to Indian Standard specifications, a 30-meter chain consists of 100 links. The length of an individual link is determined by dividing the total chain length by the number of links. \[\text{Length of one link} = \frac{30 \, \text{meters}}{100} = 0.30 \, \text{meters} = 30 \, \text{cm}.\]
Step 2: Result.
Consequently, a single link in a 30-meter chain measures 30 cm. This confirms option (2) as the correct choice.
Final Answer: \[ \boxed{30 \, \text{cm}} \]