Упростите выражение \(\frac{3c+7}{c^2+7c}+\frac{c-7}{7c+49}.\)

• \(\frac{c+7}{7c}\)
• \(\frac{4c}{c^2+14c+49}\)
• \(\frac{4c}{(c+7)^2}\)
• \(\frac{21c +c^2}{c^2+14c+49}\)