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The following piece of C code aims to open a file and write a message on the screen to specify whether the file has been opened succesfully or not. FILE *Ep=fopen ("student.txt", "w+"); printf("Error opening file"); else printf ("opened file successfully"); fclose(fp); Choose the correct statement for missing part. a) if (feof(fp)) b) if(!feof(fp)) c) if (fp-NULL) d) None of above a) correct answer: a correct answer: b c) correct answer: d) correct answer:d