M and N be subspaces of a vector space V. Consider the following subsets of V. Mn N. (A vector v belongs to MnN if it belongs to both M and N.) MUN. (A vector v belongs to MUN if it belongs to either M or N.) M + N. (A vector v belongs to M + N if there are vectors m€ M and n N such that v= m + n.) MN. (A vector v belongs to M - N if there are vectors me M and n E N such that v mn.) = Which of (a)-(d) are subspaces of V? Answer:

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