please code in C++ and with comments so i can understand the code. Thank you.

• Create a program to grade a 20 question true/false test.
• All input will come from a file
• The first line of the file contains the answer key for the test
  • For example: TFFTFFTTTTFFTFTFTFTT
• Every other entry in the file is the student ID, followed by a space, followed by the students responses.
  • Spaces in the student's answers indicate the student did not answer a question.
  • For example, the entry: ABC54301 TFTFTFTT TFTFTFFTTFT indicates that the student ID is ABC54301 and the answer to question 1 is true, the answer to question 2 is false, and so on.
    • This student did not answer question 9.
• The class has an unknown number of students.
• Each correct answer is awarded two points, each wrong answer gets one point deducted, and no answer gets zero points.
• The output should be
  • the students ID,
  • the student's test score,
  • the student's letter grade.
• Assume the following grade scale:
  • 90%100%, A;
  • 80% 89.99%, B;
  • 70%79.99%, C;
  • 60%69.99%, D;
  • < 59.99%, F.
• All output should be written to a file and formatted properly.
  • Test scores should be rounded to two decimal places
  • Use a tab delimiter between student items (listed above)
  • Write each student's data on a separate line.
• All arrays must be dynamic
• All interaction with the arrays must be done via a pointer.
• Use pointer arithmetic to traverse the arrays