A URL (Uniform Resource Locator) is an identifier used to locate resources on the web. A URL is composed of the following components: Scheme, Host Name (with optional Port Number), Path, (optional) Query String, (optional) Anchor. These components are arranged in the following format: Scheme://Hostname:Port/Path?QueryString#Anchor For example, in the URL "https://en.wikipedia.org:443/wiki/Kitten?printable=yes&download=no#External_links": "https" is the Scheme, "en.wikipedia.org" is the Hostname, 443 is the Port Number, "wiki/Kitten" is the Path, "printable=yes&download=no" is the Query String, and "External links" is the Anchor. The Hostname is composed of (optional) subdomain(s), second-level domain, and top-level domain. e.g., for the Hostname "en.wikipedia.org": "en" is the subdomain, "wikipedia" is the second-level domain, and "org" is the top-level domain. Consider a variable "URL" containing a valid URL that follows the format above. Which of the following expression(s) correctly extracts the second-level domain from the URL and assigns it into the "seconddomain" variable? There may be more than one correct answer. Select all correct answers. parts strsplit/IIRI CollapseDelimiter' false):