The correct answer is: A. Low and high water mark.
A low water mark is the minimum amount of data that must be present in a buffer before it can be used. A high water mark is the maximum amount of data that can be stored in a buffer. By tracking the low and high water marks, it is possible to detect and correct errors in the linear buffer.
A pointer is a variable that stores the current position in a buffer. It is used to keep track of where data is being written to or read from the buffer. However, a pointer cannot be used to detect or correct errors in the linear buffer.
A high water mark is the maximum amount of data that can be stored in a buffer. It is used to prevent the buffer from overflowing. However, a high water mark cannot be used to detect or correct errors in the linear buffer.
A low water mark is the minimum amount of data that must be present in a buffer before it can be used. It is used to prevent the buffer from underflowing. However, a low water mark cannot be used to detect or correct errors in the linear buffer.
In conclusion, the only technique that can solve the errors in the linear buffer is A. Low and high water mark.