पूंजी और श्रम की निरंतर प्रतिस्थापनीयता (Continuous substitutability) को निम्नलिखित में से किस वक्र द्वारा दर्शाया जाता है?

The point at which the total product curve begins to flatten out indicates:

Which of the following statements regarding the Cobb-Douglas Production Function Q = A Lα Kβ are correct? I. The positive constants α and β represent the output elasticities of labor and capital, respectively. II. Constant returns to scale are achieved when α + β = 1. III. The function can be expressed in logarithmic form as ln(Q) = ln(A) + α ln(L) + β ln(K). IV. The constant 'A' represents total factor productivity or technological progress. Choose the most appropriate answer from the options given below: