Consider the infinite series k=5∑∞k−41. Which statement about its convergence is correct?
a) It diverges since its terms behave like k1, matching the harmonic series.
b) It converges because the index shift decreases each term enough to form a convergent series.
c) It converges as a p\!-series with p>1 after the index shift.
d) It converges by comparison with the convergent series k=5∑∞k21."