Good morning, Betty. Either option will work. I got the original book out of the library and the
instructions are as simple and undefined as all the websites have stated: basically, blend the dry stuff, add the wet stuff, beat it well, add the chunky stuff (carrots, pineapple, etc) and bake. I haven't a CLUE how I've been making it perfect for 20 years, but there you go.
The book specifies two 9" springforms and the timing for that is 50 minutes. If you used three 9" x 1.25" pans, the layers would be done sooner. Test the middle by touching it to spring back lightly. I just made a second test in an 8" x 3" pan using 1/3 of the recipe and it rose a full 2 inches. I did beat the eggs and sugar until tripled and streamed in the oil slowly. Both test cakes rose to an almost flat surface.
Just don't use three standard 8" x 1.25" standard cake pans. Even three of those won't hold all the batter once it rises.