Radioactive element A decays to the stable element B with a half-life T.Starting with a sample of pure A and no B, which graph below most correctly shows the number of A atoms, NA, as a function of time t? 
Definitions:
ALU
Arithmetic Logic Unit (ALU) is a critical component of a computer's processor that performs all arithmetic and logical operations within the computer.
Microprocessor
A compact integrated circuit designed to perform the operations and functions of a computer's central processing unit (CPU).
Eight-Bit String
A sequence of data that is eight bits long, often representing a single character in text encoding systems like ASCII.
Byte
A unit of data that typically represents a single character of text in digital computing and storage.
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