Need answer ASAP. No links Select the correct answer from each drop down menu

Which of the options is an empty element

___ it is an empty element. It is not have a ___

Options for the first box are: a, input, and p

Options for the second box are: starting tag, ending tag, and attribute

The managing director of a company sends a christmas greeting to all his employees through the company email. which type of network does he use? he uses an .

Suppose there is a relation r(a, b, c) with a b+-tree index with search keys (a, b).1. what is the worst-case cost of finding records satisfying 10 < a < 50 using this index, in terms of the number of records n1, retrieved and the height h of the tree? 2. what is the worst-case cost of finding records satisfying 10 < a < 50 and 5 < b < 10 using this index, in terms of the number of records n2 that satisfy this selection, as well as n1 and h defined above? 3. under what conditions on n1 and n2, would the index be an efficient way of finding records satisfying the condition from part (2)?

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