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Consider a file of records of the following type: typedef struct { int id; // unique...

Consider a file of records of the following type:

typedef struct {
   int   id;        // unique identifier
   char  desc[100]; // description of item
   float price;     // wholesale price
} Record;

And the following variables:

int    fd;  // file descriptor, open on file for read/write
Record rec; // record which is set to appropriate values

If the file is non-empty and fd is currently positioned at the end-of-file, which of the following pairs of statements will update the 11th record in the file fd with the value currently stored in rec?

None of the other options is correct

 
lseek(fd, 10*sizeof(Record), SEEK_SET);
write(fd, &rec, sizeof(Record));

lseek(fd, 10, SEEK_SET);
write(fd, rec, sizeof(Record));

lseek(fd, 10, SEEK_SET);
write(fd, &rec, sizeof(Record));

lseek(fd, 10*sizeof(Record), SEEK_CUR);
write(fd, rec, sizeof(Record));
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Answer #1 
Answer:
lseek(fd, 10*sizeof(Record), SEEK_SET);
write(fd, &rec, sizeof(Record));
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