The correct answer is Option 1: 1 and 2 only.

1. It is capable of swimming up to three kilometres in seawater.

The Kharai Camel is known for its unique ability to swim in seawater. This breed is found in the coastal regions of Gujarat, India, and has adapted to its environment by developing the ability to swim up to three kilometers in seawater. This makes it well-suited to survive in coastal regions where other camel breeds may struggle to find food and water.

2. It survives by grazing on mangroves.

The Kharai Camel has adapted to its coastal habitat by feeding on mangroves, which are a type of salt-tolerant shrub that grows in coastal areas. This unique feeding behavior allows the Kharai Camel to survive in environments where other camel breeds may not have access to adequate grazing resources. Mangroves are an important source of food for the Kharai Camel, and their ability to graze on these plants is a key characteristic that sets them apart from other camel breeds.

3. It lives in the wild and cannot be domesticated.

This statement is incorrect. The Kharai Camel, like other camel breeds, can be domesticated and kept by humans for various purposes, such as transportation, milk production, and meat production. In fact, the Kharai Camel is often owned and managed by local communities in coastal regions of Gujarat, India. It is not a wild camel breed, but rather a domesticated breed that has adapted to its coastal environment.

In conclusion, the unique characteristics of the Kharai Camel are its ability to swim in seawater and feed on mangroves, making it well-suited for survival in coastal regions. However, it is important to note that the Kharai Camel can be domesticated and is not a wild breed. Therefore, the correct answer is Option 1: 1 and 2 only.