Insert the correct syntax for specifying that the plot should be of type 'histogram'.
df['Duration'].plot(@(13))
df['Duration'].plot(kind = 'hist')
df['Duration'].plot(kind = "hist")
df['Duration'].plot(kind='hist')
df['Duration'].plot(kind="hist")
df['Duration'].plot(kind= 'hist')
df['Duration'].plot(kind= "hist")
df['Duration'].plot(kind ='hist')
df['Duration'].plot(kind ="hist")