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Which of the following statements is true?
| a. |
As knowledge graphs are schema free, no design of the schema is required. |
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| b. |
Knowledge graphs are always created using automatic techniques. |
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| c. |
For many knowledge graph applications, a perfect accuracy is not a hard requirement. |
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| d. |
Knowledge graphs can contain undirected relationships. |
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| e. |
Knowledge graphs do not use keys and foreign keys as defined for the relational database systems. |
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