a) causes low level of noise pollution
b) it does not require skilled work
c) labour cost is low
d) removing poorly installed rivet is costly

Answer: d
Explanation: (i)Rivet connection is associated with high level of noise pollution, (ii)needs heating rivet to red hot, (iii)inspection of connection is skilled work, (iv) removing poorly installed rivet is costly, (v)labour cost is high.