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If a table is created and it is later determined that additional fields should be added to the table, it is usually preferable to

a) delete the existing table and re-create it with the additional fields b) create a parallel table that holds just the additional fields c) re-define an existing field in the table to hold the additional data d) delete the entire database and start over e) alter the table to add the additional fields

A binary tree with depth d is complete if

A) each level L < d has 2L nodes B) every node that is not a leaf has 2 children C) every node that is not a leaf has 2 children and all nodes at level d are as far to the left as possible D) each level L < d has 2L nodes and all nodes at level d are as far to the left as possible