What is TRUE for Standard Extension Database Column
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Type is Data (Private)
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Always prefixed with ‘X_’
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Provided by Siebel for Developers use
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Cannot be edited
Standard Extension database columns in Siebel are custom columns that developers can add to extend base tables. They are always prefixed with 'X_' to distinguish them from standard Siebel columns. Option B is correct: they are prefixed with 'X_'. Option A is incorrect (type is not private data), Option C is misleading (they are for developer use but not provided by Siebel), Option D is incorrect (they can be edited).
Standard Extension Columns in Siebel's database schema are always prefixed with 'X_' to distinguish them from Siebel's own base columns — they are reserved, pre-built extension slots that administrators/developers can rename and use for custom data without altering the physical schema. They are not private data types, they aren't 'provided for developer use' in the sense of being freely created (they're pre-defined by Siebel, just relabeled), and they can in fact be edited/repurposed (renamed, added to business components), so 'cannot be edited' is false. The 'X_' prefix convention is the defining, verifiable characteristic.