When there is a discriminator of a weak entity how is the set specified? a$.$ using a circle b$.$ using a solid line c$.$ using a dashed line d$.$ using a square $37.$ Normalization purity is often difficult to sustain in the modern database environment due to which of the following? a$.$ all tables must be in $3$NF b$.$ performance is improved at higher normal forms c$.$ normalization is permanent d$.$ they contain partial and$/$or transitive dependencies $38.$ Normalization works through a series of stages called normal forms. For most purposes in business database design, $\_\_\_\_\_$ stages are as high as you need to go in the normalization process. a$.$ two b$.$ three c$.$ four d$.$ five $39.$ From a structural point of view, $3$NF is better than $\_\_\_\_\_.$ a$.2$NF b$.3$NF c$.5$NF d$.6$NF $40.$ When using a cross join between a table with $8$ rows and another with $5$ rows how many rows are in the result? a$.10$ b$.13$ c$.20$ d$.40$