Good question. When one Endorces or "Hires/ payes" someone again for a job/thing they did. I think. :)
Answer:
B - array; hash
Explanation:
Arrays store elements of the same data type in a list. Every element in the array is assigned a unique integer (starting at 0). You are able to access/process an element by using its assigned integer. Hashes are similar in the fact that they also store data. The difference is that each element is assigned an object type (instead of an integer), making it a collection of key pairs, as such you would typically not use this to process elements efficiently.
Answer:
approximately 5 lbs but no sure weight.
Solution :
It is given that Lael always looks out for the students who are interested in running for the office in a student group.
We use an excel sheet to determine whether a student had already elected to the office of the student group or not.
The formula used for the excel sheet used is :

K L M N
Elected group Finance certificate
Yes Yes Yes
No Yes Yes
No No No