Question: What is the time required to download the software?

• To calculate the time required to download the software, we need to divide the size of the software by the transfer rate.

Statement-I alone: The size of the software is 12 megabytes. 

• We know the size of the software. 
• However, without knowing the transfer rate, we cannot calculate the time required to download it. 
• So, Statement-I alone is not sufficient to answer the question.

Statement-II alone: The transfer rate is 2-4 kilobytes per second.

• We know the transfer rate.
• However, we don't have information about the size of the software. Without the size, we cannot calculate the time required to download the software. So, Statement-II alone is not sufficient to answer the question.

Combining both statements: 

• We have information about both the size of the software and the transfer rate. 
• Using the formula Time = Size / Transfer Rate, we can calculate the time required to download the software.