Given the following code, write a C statement to open the file “customers.txt” for reading in data.

What is a good motivation for having multiple index files for external data?

a. to save external file space b. allows multiple data organizations c. splits up the data easier d. save internal data storage

Which of the following statements is true?

a. Ranges of characters can be represented by placing a ~ between two characters. b. [^Z] is the same as [A~Y]. c. Both “A*” and “A+” will match “AAA”, but only “A*” will match an empty string. d. All of above.