Answer:
a. Tabbed browsing
Explanation:
Tabbed browsing is a feature in the browser that helps in operating several tabs at the same time. It helps in browsing different links without opening different browsers. Multiple pages can be opened and surfed at the same time in one window. Any link can be opened in a different or new tab by clicking right on the link. After this, 'open link in new tab' is to be selected and the link gets opened respectively.
Packaged software is a compilation of programs which are grouped together in order to provide publicly with different tools in the same group.
Custom software is a specific program that are advanced for a goal in a department or in a company.
