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TextRank formula

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What is the $d$ parameter in the TextRank node score formula? As a reminder, the formula looks as following:

$\text{WS}(V_i) = (1 - d) + d* \sum_{V_j \in \text{In}(V_i)} \frac{w_{ij}}{\sum_{V_k \in \text{Out}(V_j)} w_{jk}}\text{WS}(V_j)$

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The damping factor, the probability of jumping from a node to a random node

The damping factor, the probability of jumping from a node to a connected node

The random node value, assigned upon initialization

The threshold below which the node's score becomes stable

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