Select all that are true when you introduce denormalization. (Check all that apply.) a. A possibility of data anomalies and inconsistencies when selecting copies of the redundant data b. By reducing the number of joins - complexity is decreased and performance is potentially improved when selecting data. c. Updating redundant data in a denormalized table which does not have foreign key constraints will insure consistency of that data. d. One way to implement denormalization is to create 1:1 relationships between entities e. Data redundancy from denormalization causes slower SELECT queries because there are more join statements.