32bits or 64bits system

hello everyone
I have just began LFS. I read to "LFS Target Architectures" page:
http://www.linuxfromscratch.org/lfs/view/stable/prologue/architecture.html
At here, I can't distinguish between 32bits and 64bits in the following 2
cases (i marked it red and boold):

No |  Processor   |     Operating system   =>    System   |  Me
 1  |     32bits      |             32bits           =>       32bits   | i
am OK
 2  |     64bits      |             64bits           =>       64bits   | i
am OK

* 3  |     32bits      |             64bits=> I don't know that my system
is 32bits or 64bits? 4  |     64bits      |             32bits=> I don't
know that my system is 32bits or 64bits?*
Please show me what is true. thank you very much!

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