What should be the value of “pattern” in regular expression?Note: Python regular expression library has been imported as re. pattern = ‘(i|ie)(,)’pattern = ‘(i$|ie$)(,)’pattern = ‘([a-zA-Z]+i|[a-zA-Z]+ie)(,)’None of these

The value of "pattern" in a regular expression depends on what you are trying to match in a string. Here are what the given patterns mean:

1. pattern = '(i|ie)(,)': This pattern will match any string that contains 'i' or 'ie' followed by a comma. The '|' symbol is a logical OR operator, meaning it will match either 'i' or 'ie'. The parentheses group 'i' and 'ie' together as one unit. The '(,)' means it will also match a comma.

2. pattern = '(i$|ie$)(,)': This pattern will match any string that ends with 'i' or 'ie' followed by a comma. The '$' symbol means end of the line.

3. pattern = '([a-zA-Z]+i|[a-zA-Z]+ie)(,)': This pattern will match any string that contains one or more letters (either lowercase or uppercase) followed by 'i' or 'ie' and a comma. The '+' symbol means one or more of the preceding element.

4. None of these: This option means that none of the above patterns are correct.

Without knowing what you are trying to match in a string, it's impossible to say which pattern should be the value of "pattern". You would need to choose the pattern that best fits your needs.