The clause in question raises two separate legal issues under the Transfer of Property Act, 1882 - whether a perpetual gift for a public library survives the rule against perpetuity, and whether a 50-year accumulation direction survives the rule against accumulation. Applying both limbs together to each option identifies the correct one.
Running both the perpetuity exception and the accumulation cap against each option shows that only the first option applies each rule to its correct portion of the transaction - upholding the gift and trimming only the excess accumulation.
Therefore, the correct answer is The transfer is valid as it falls within the exception for public benefit, but the accumulation clause is void to the extent it exceeds statutory limits.