| there is centralized control of all email addresses. The following are characteristics of proprietary databases except : | | they may be searched by a general Web search engine | | | they may include extra information unavailable elsewhere | | | they make it easy to download information | | | they may provide training to users | Which statement is true of specialized databases? | | They all use the same search syntax | | | They are available on the Web for free | | | They are also called subject guides | | | They include information you often wouldnt find on a search engine | The following is true of white pages services: | | You can have your name removed from a listing. | | | They allow users to obtain addresses for spam. | | | They have privacy policies that you should read before using them. | | 
