Please provide a justification for adopting access control, mentioning if using public or private keys is relevant. A string: What precisely is it? Please give an illustration of a String. When we use the term "String Concatenation," what precisely do we mean? Give an instance. Can you give any examples of how to concatenate a String with other fundamental data types?

Write a regular expression, usable with Python's re.search, which captures in its capture groups the parts of a rudamentary URL as defined below: Examples of URLs: http://bing.com https://google.com https://yahoo.com https://www.ycombinator.com/ The pattern should capture: The scheme (the "https://" part) The domain (the part after the scheme and before the top level domain (TLD), e.g. "bing" or "www.ycombinator") The top level domain (aka. TLD) (the last part, eg. "edu", "com", "gov") You do not need to handle URLs with paths (such as http://google.com/foo/bar), unless the path is just / as above, nor do you need to handle URLs with query strings (such as https://example.com?foo=bar). For the last example: >>> re.search(pattern, 'https://www.ycombinator.com/').groups() ('https://', 'www.ycombinator', 'com') Assign your pattern to a variable named pattern.

2. Write about reader process in mutual exclusion with help of an example program.

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