Question: Given the following declarations, which variable ( s ) has an equivalent type to variable p under strict name equivalence? - - three type declaration

Given the following declarations, which variable(s) has an equivalent type to variable p under strict name equivalence?
--three type declaration
type cell =... whatever
type alink = pointer to cell
type blink = alink
--variable declaration below
p , q : pointer to cell
r : alink
s : blink
t : pointer to cell
u : alink
Question 2 options:
r, u
s
q, t
q
q, r, s, t, u

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