This question is about CNN. Given an input feature map with the size of 64×64×128 (W ×H ×C), by applying a 3 × 3 convolu

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This question is about CNN.
Given an input feature map with the size of 64×64×128 (W ×H ×C),
by applying a 3 × 3 convolutional layer to it, we obtain an output
feature map with the size of 64 × 64 × 256.
Which of the following statement is correct?
This convolutional layer has 256 3 × 3 kernels.
This convolutional layer has 256 3 × 3 × 128 kernels.
This convolutional layer has 128 3 × 3 kernels.
This convolutional layer has 128 3 × 3 × 256 kernels.