Pick up the correct specification of one-room quarters generally adopted from the following: A. Six quarters in a row B. The size of room is either 3.5 m × 3 m or 4.2 m × 2.5 m C. The front verandah is kept 2 m wide D. All the above

The correct answer is D. All the above.

One-room quarters are generally adopted with the following specifications:

• Six quarters in a row
• The size of room is either 3.5 m × 3 m or 4.2 m × 2.5 m
• The front verandah is kept 2 m wide

These specifications are based on the following considerations:

• The need to provide adequate space for each occupant
• The need to ensure that the quarters are well-ventilated and have adequate natural light
• The need to make the quarters affordable

The size of the room is determined by the number of occupants and the amount of furniture and other belongings that they need to store. The front verandah is provided to provide a place for the occupants to sit and relax.

The specifications for one-room quarters are typically set by the government or by local authorities. They may vary depending on the country or region.