Concept: The Minimum Wages Act, 1948 protects workers by ensuring that they receive at least the minimum wages fixed by the appropriate government.
Step 1: Understand payment of minimum wages.
Minimum wages are intended to provide basic economic protection to workers.
\[
\text{Minimum wages} \Rightarrow \text{Basic wage protection}
\]
Step 2: Identify the mode of payment.
The general rule is that minimum wages payable under the Act shall be paid in cash.
\[
\text{Minimum wages} \Rightarrow \text{Cash payment}
\]
Step 3: Choose the correct answer.
Therefore, the correct answer is in cash.