If the thickness range of a specimen is too great for a single exposure, a multifilm technique may be used. If two films of different speeds are selected for this example, the log relative exposure range for these two films is:

The difference in log exposure between the value at the high-density end of the faster film and the low-density end of the slower film curve.

The difference in log exposure between the value at the low-density end of the faster film and the high-density end of the slower film.

The difference in log exposure between the value at the low-density end of the slower film and the high-density end of the faster film.

The difference in log exposure between the value at the high-density end of the slower film and the low-density end of the faster film.

None of the above.