Concept: Registration of a trade mark gives statutory protection to the proprietor of the mark. However, such registration is valid only for a fixed period and must be renewed.
Step 1: Understand trade mark registration.
A trade mark identifies goods or services and distinguishes them from those of others.
\[
\text{Trade Mark} \Rightarrow \text{Identity of goods or services}
\]
Step 2: Recall the period of registration.
Under the Trade Marks Act, registration of a trade mark is valid for ten years.
\[
\text{Validity of registration} = 10 \text{ years}
\]
Step 3: Understand renewal.
After expiry of the ten-year period, the registration may be renewed according to the provisions of the Act.
Therefore, the correct answer is 10 years.