AT&T INC. €1,000,000,000 3.600% Global Notes due 2030 €1,250,000,000 4.150% Global Notes due 2034 €1,000,000,000 4.550% Global Notes due 2038 €850,000,000 5.050% Global Notes due 2045 £550,000,000 7.050% Global Notes due 2052 UNDERWRITING AGREEMENT