"Tongrentang" is an "old brand" in Beijing. There is a couplet hanging at the door of its store: although the taste is expensive, it does not dare to reduce material resources. Although the processing is complicated, it does not dare to save labor. This pair of couplets embodies the corporate culture connotation of Tong Ren Tang. This connotation is (d)

A, if the enterprise wins in the competition, it must improve labor productivity.

B, enterprises should have the spirit and consciousness of pioneering and innovation.

C, increasing cost input is the key to improve competitiveness.

D, enterprises should adhere to the principle of honesty and trustworthiness