निम्नलिखित में से कौन सा समीकरण चरघातांकी जनसंख्या वृद्धि मॉडल (exponential population growth model) के एकीकृत रूप को सही ढंग से दर्शाता है?

In logistic population growth described by the equation dNdt = rNK - NK, the growth rate becomes zero when:

In exponential population growth, the shape of the growth curve obtained when population size (N) is plotted against time (t) is: