Read the following sentence and choose the option from the word group that best fits the blank.

Read the following sentence and choose the option from the word group that best fits the blank.

One of the international image recognition competitions is ILSVRC (ImageNet Large Scale Visual Recognition Competition). Since then, CNN's model (a) won the competition in 2012, and since then, CNN's models have been achieving high results one after another. In 2015, (d), which enables deep network learning called residual learning, won the first place, respectively.

1. AlexNet
2. ElmanNet
3. GoogLeNet
4. ImageNet
5. LeNet
ResNet
VGG
WaveNet