What is the key difference between a universal Turing machine and a modern digital computer?

Question $1$Answer

a$.$

A digital computer can answer the same questions as the universal Turing machine, only more efficiently

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b$.$

A digital computer cannot answer the same questions as the universal Turing machine because of its finite memory

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c$.$

A digital computer can solve many more information processing problems than a universal Turing machine because it is more modern

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d$.$

A digital computer can solve many more information processing problemss than a universal Turing machine, because the Turing machine is not digital

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