which of the following is correct code to close all references com..., C#, .Net Technology

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Question:Which of the following is the correct code to close all references to the com objects below?Workbooks books = excel.WorkBooks;
Workbook book = books[1];
Sheets sheets = book.WorkSheets;
Worksheet ws = sheets[1];

A Marshal.ReleaseComObject(books); 
B Marshal.FinalReleaseComObject(books); 
C Marshal.ReleaseComObject(sheets); 
Marshal.ReleaseComObject(books); 
D Marshal.ReleaseComObject(sheet); 
Marshal.ReleaseComObject(sheets); 
Marshal.ReleaseComObject(book); 
Marshal.ReleaseComObject(books);

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Question:Which of the following is the correct code to close all references to the com objects below?Workbooks books = excel.WorkBooks; Workbook book = books[1]; Sheets sheets = book.WorkSheets; Worksheet ws = sheets[1];

A Marshal.ReleaseComObject(books);

B Marshal.FinalReleaseComObject(books);

C Marshal.ReleaseComObject(sheets); Marshal.ReleaseComObject(books);

D Marshal.ReleaseComObject(sheet); Marshal.ReleaseComObject(sheets); Marshal.ReleaseComObject(book); Marshal.ReleaseComObject(books);

C

Question:Which of the following is the correct code to close all references to the com objects below?
Workbooks books = excel.WorkBooks; Workbook book = books[1]; Sheets sheets = book.WorkSheets; Worksheet ws = sheets[1];