The word "highest" is a superlative and what that means is that there can be only one such number. Si there can be only one highest common factor, not factors.
HCF(28, 32) = 4.
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1 and the highest common factor is 4
The common factors of 30 and 32 are: 1 and 2
For 28: 2 and 7 For 32: 2
32 and 85 share no common factors aside from 1.