Karan lives at a hostel in Shimla. He calls his mother who lives in Delhi, to get herapproval for the robotics class which is going to start in his school next weekonwards. However, due to disruption in the phone line, his mother could notunderstand and reply to him. He got very upset. Which another medium can he useto get immediate approval of his mother?

In the context of the question, Karan needs to get immediate approval from his mother for a robotics class that is starting next week. The disruption in the phone line has made it impossible for him to communicate with his mother through a phone call. Therefore, he needs to find an alternative method that is both immediate and reliable.

Email is the most suitable alternative in this scenario. It is a digital communication method that allows for quick transmission of messages. Emails can be sent and received almost instantly, provided both parties have access to the internet and an email account. This makes it an ideal choice for urgent communication needs, such as getting approval for a class that is starting soon.

Other methods like fax, messaging through friends, and sending a letter are not as efficient or reliable for immediate communication. Fax machines are not as commonly used today and may not be immediately accessible. Messaging through friends introduces delays and potential miscommunication. Sending a letter can take several days to reach the recipient, which is not suitable for urgent matters.

Therefore, email stands out as the best alternative for Karan to get immediate approval from his mother. It is a widely used and efficient method of communication that can be accessed from various devices, making it a reliable choice in situations where other methods fail.