Read the passage carefully and answer the question. Didi Contractor belongs to that rare group of individual architects in India that, despite all odds, forged a work life which clearly sets them apart from other professionals. In this small group Laurie Baker was the first to break away; in over a thousand structures he built in Trivandrum alone, he came to be known as the poor man's architect. 'A better building at half the cost', he often said. Nari Gandhi, better known in Mumbai's affluent circles as a design icon with unusual solutions to domestic architecture, practised little but left an unusual craft legacy. Contractor built a sizeable body of domestic structures in Himachal Pradesh, working as much as a naturalist and ecologist as an architect. Yet Baker's low cost, Gandhi's craft, or Didi's ecology—whatever differing outward perceptions their work held for the viewer and the user—their common single-minded struggle was the desire to express our greatest source of inspiration: beauty. It mattered little that Baker's client was a poor fisherman family, that Gandhi designed a staircase for a shipping tycoon, or that Didi's earth-block construction and local stonework were simple. Every bit of labour that went into these buildings said with clarity that each structure was a generous gift to the eye, to the human spirit, and to the engagement with people and materials. Select the statement that is true according to the passage.

1. Nari Gandhi was primarily known for designing low-cost housing.
2. Didi Contractor built a significant number of homes in Himachal Pradesh.
3. All three architects primarily worked with wealthy clients.
4. Laurie Baker's work mainly focused on using eco-friendly materials.