Explanation:

- Small scale industries (SSIs) are critical for economic development, especially in developing countries.

- Option: 1, Less than Five Lakh: Initially, the investment cap for SSIs in India was very low, around this range, but this limit is outdated.

- Option: 2, Less than Ten Lakh: This was relevant when the definition of SSIs was different decades ago.

- Option: 3, Twenty Crore: This can relate to medium-scale industries, not small-scale.

- Option: 4, Less than ten Crore: Currently, in India, as per the MSME (Micro, Small, and Medium Enterprises) classification, small scale industries can have an investment in plant and machinery not exceeding ten crore rupees.