Question: so the answer for this one is d = 1. So, the ARIMA becomes (0,1,0). Can you please explain in simple terms how it became

so the answer for this one is d = 1. So, the ARIMA becomes (0,1,0). Can you please explain in simple terms how it became d=1 where there is no (1-B)? And how the ARIMA becomes (0,1,0). Please explain in simple terms
(b) xt=1.3xt10.3xt2+wt0.3wt1
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