Which is the correct structure for the amino acid cysteine? 
Definitions:
Multinomial Experiment
An experiment consisting of a fixed number of trials where each trial has multiple possible outcomes and the trials are independent.
Null Hypothesis
A statistical hypothesis that assumes no significant difference or effect exists between certain characteristics or parameters of a population or dataset.
Level of Significance
A threshold used in hypothesis testing to determine the probability of rejecting a true null hypothesis, commonly set at values like 0.05 or 0.01.
Degrees of Freedom
The quantity of distinct variables or measures that may fluctuate during an evaluation without breaching any restrictions.
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