Normalization reduces disk space. If you have 50 tables that all have a column Address that can be 50 characters long, that will take more space than having a table with Address and all those 50 tables referring to the Address table by id.
This also can actually increase chance of corruption - if that Address table gets corrupted, all the tables that use it are negatively affected as well.
because normalization reduces redundancy (repeat of information) it also reduces space usage. so the answer is actually correct.
side note: normalization can actually increase the risk of corruption, since it consists (generally) of breaking tables into more tables related to each other, deleting or updating on table and not the others may corrupt data
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