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The roots of some higher plants are associated with fungal mycelia. Such an association is called mycorrhiza. It represents a mutualistic(symbiotic) association between the root system of higher plants and fundal hyphae. The fungal hyphae form a network around the young root and invade the root cells. The external hyphae greatly increase the surface area for absorption of minerals and water from a much larger volume of soil that perhaps the roots alone cannot do.

So, the correct answer is 'Both A and B'.