我国国债是指( )向投资者出具的、承诺在一定时期支付利息和到期偿还本金的债权债务凭证。

A．中国银行
B．中央政府
C．财政部
D．国务院

In the context of company law:

(a) explain the ways in which a company may raise capital by way of equity and by way of debt; and (3 marks)