To answer this question, you need to understand the concept of data types in SQL.
Option A) Fixed length string of n characters - This option is incorrect because varchar is a variable-length string data type, not a fixed-length string.
Option B) Variable length string up to n characters - This option is correct. Varchar is a data type that allows you to store variable-length strings with a maximum length of n characters.
Option C) Floating point number of p bits precision - This option is incorrect because varchar is not a data type for storing floating-point numbers.
Option D) 16-bit signed integer - This option is incorrect because varchar is not a data type for storing integers.
Option E) 32-bit signed integer - This option is incorrect because varchar is not a data type for storing integers.
The correct answer is B) Variable length string up to n characters. This option is correct because varchar is a data type in SQL that allows you to store variable-length strings with a maximum length of n characters.