Case-Based Critical Thinking QuestionsCase 6-2Leon recently started to use CSS positioning properties to position his Web page elements and has been very frustrated. He asked his cousin James to give him some examples and general information that will help him better understand what to do.Which of the following is NOT a true statement James can make to Leon?
A. The left property with a positive value positions an element a certain distance from the left edge of the screen.
B. The top property with a positive value positions an element a certain distance from the top edge of the screen.
C. The bottom property with a negative value will move an element down the screen.
D. The right property with a negative value will move an element to the left.
Answer: D
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Calculate the cardinality and minimum cost for each of the following Join operations:
? a hash index with no overflow on the primary key attributes, roomNo/hotelNo in Room; ? a clustering index on the foreign key attribute hotelNo in Room; ? a B + -tree index on the price attribute in Room; ? a secondary index on the attribute type in Room. nTuples(Room) = 10000 bFactor(Room) = 200 nTuples(Hotel) = 50 bFactor(Hotel) = 40 nTuples(Booking) = 100000 bFactor(Booking) = 60 nDistinct hotelNo (Room) = 50 nDistinct type (Room) = 10 nDistinct price (Room) = 500 min price (Room) = 200 max price (Room) = 50 nLevels hotelNo (I) = 2 nLevels type (I) = 2 nLevels price (I) = 2 nLfBlocks price (I) = 50 J1: Hotel hotelNo Room Assume nBuffer = 100 J2: Hotel hotelNo Booking J3: Room roomNo Booking J4: Room hotelNo Hotel J6: Booking roomNo Room