Which neural coding scheme does the vector averaging belongs to? A: cable line coding B: population coding C: color coding D: shape coding

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Set X_i=(x_i (1),x_i (2),⋯,x_i (n)) as the behavior sequence of factor X_i, D_1 as the sequence operator, and X_i D_1=(x_i (1)d_1,x_i (2)d_1,⋯,x_i (n)d_1), where x_i (k)d_1=x_i (k)/x_i (1); x_i (1)≠0, k=1,2,⋯,n, then D_1 is A: A. Initial valued operator B: B. Averaging operator C: C. Interval valued operator D: D. Invert operator