The code x = '\\\' is not erroneous. This is a valid Python string assignment. In Python, the backslash (\) is an escape character.
Here's how it works in this case:
The first backslash escapes the second backslash, resulting in a single backslash character.
The third backslash is not followed by any special character, so it remains as a backslash.
Therefore, the string x actually contains two backslashes: '\\'.
So, the length of the string x is 2.
Thus, the correct answer is:
B. 2
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