Nexus Co$.$ had a long$-$term stable debt$-$to$-$equity ratio of $0\mathrm{.}65.$ Recent bank borrowing for expansion into South America raised the ratio to $0\mathrm{.}75.$ The increased leverage has what effect on the asset beta and equity beta of the company?

a$.$ The asset beta will decline, and the equity beta remain the same.

b$.$ The asset beta will rise, and the equity beta remain the same.

c$.$ The asset beta will remain the same, and the equity beta will rise.

d$.$ The asset beta and the equity beta will both rise.

e$.$ The asset beta will remain the same, and the equity beta will decline.