Correct Answer - Option 1 : MUL:ISZ:56438756:Rub/77650:Alto:ext:003487027854

The given code: MUL:ISZ:56438756:Rub/77650:Alto:ext:003487017854

Mistake(s) in the first option: MUL:ISZ:56438756:Rub/77650:Alto:ext:0034870**(2)**7854 → (one mistake)

Mistake(s) in the second option: MUL:ISZ:56438756**(;)**Rub/77650:Alto:**(E)**xt:003487017854 → (two mistakes)

Mistake(s) in the third option: MUL:ISZ:56**(7)**38756:Rub/77650:Alto:ext:003487**(6)**17854 → (two mistakes)

Mistake(s) in the fourth option: M**(O)**L:ISZ:56438756:Ru**(d)**/77650:Alto:ext:003487017854 → (two mistakes)

Clearly, **the first option i.e. 'MUL:ISZ:56438756:Rub/77650:Alto:ext:003487027854' has only one mistake.**