The following sample file called grades.txt contains grades for several students in an imaginary class. Each line of this file stores a student's name followed by their exam scores. The number of scores might be different for each student. abdul 10 15 20 30 40 erica 23 16 19 22 haroon 8 22 17 14 32 17 24 21 2 9 11 17 omar 12 28 21 45 26 10 chengjie 14 32 25 16 89 alex 15 22 11 35 36 7 9 bryan 34 56 11 29 6 laxman 24 23 9 45 27 Now, consider the following code.  f = open("grades.txt", "r") for aline in f:     items = aline.split()     # choose your option for this part f.close() Which option prints out only the names of each student in stored in grades.txt?   Question 11 options:   print(items[0:])   print(items[0])   print(items[0][0

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.