Option 1: This option suggests that an area needs to have 10 percent or more of its gross cropped area under irrigation to be excluded from the drought-prone category. However, this is not sufficient to ensure resilience against drought as it leaves majority of the area dependent on rainfall for agriculture.

Option 2: This option states that an area should have 20 percent or more of its gross cropped area under irrigation to be excluded from the drought-prone category. While this is an improvement compared to the previous option, it still does not provide substantial protection against drought.

Option 3: This option suggests that an area needs to have 25 percent or more of its gross cropped area under irrigation to be excluded from the drought-prone category. This is a significant increase compared to the previous options and indicates a higher level of resilience against drought.

Option 4 (Correct Answer): This option states that an area should have 30 percent or more of its gross cropped area under irrigation to be excluded from the drought-prone category. This is the highest percentage mentioned among the options, indicating a greater level of water security and reduced vulnerability to drought.